Fottea 9, Number 2
ELIÁŠ, M. & NEUSTUPA, J.: Pseudomarvania, gen. nov. (Chlorophyta, Trebouxiophyceae), a new genus for "budding" subaerial green algae Marvania aerophytica NEUSTUPA et ŠEJNOHOVÁ and Stichococcus ampulliformis HANDA. - Fottea 9(2): 169–177, 2009
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LANGE-BERTALOT, H., FUMANTI, B., CAVACINI, P. & TAGLIAVENTI, N.: The genus Navigiolum (Bacillariophyceae) in Mediterranean and North African rock pool habitats: description of four new species from Algeria. - Fottea 9(2): 179–185, 2009
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COMPÈRE, P. & VAN DE VIJVER, B.: Planothidium engelbrechtii (CHOLNOKY) ROUND & BUKHTIYAROVA: Identity and lectotypification (Bacillariophyta). - Fottea 9(2): 187–192, 2009
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HINDÁKOVÁ, A.: On the occurrence of Achnanthes thermalis var. rumrichorum (Bacillariophyceae) in Slovakia. - Fottea 9(2): 193–198, 2009
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MANN, D.G., EVANS, K.M., CHEPURNOV, V.A. & NAGAI, S.: Morphology and formal description of Sellaphora bisexualis sp. nov. (Bacillariophyta). - Fottea 9(2): 199–209, 2009
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MANN, D.G. & POULÍČKOVÁ, A.: Incunabula and perizonium of Neidium (Bacillariophyta). - Fottea 9(2): 211–222, 2009
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KULIKOVSKIY, M., LANGE–BERTALOT, H., WITKOWSKI, A. & DOROFEYUK, N.: Morphology and taxonomy of selected cymbelloid diatoms from a Mongolian Sphagnum ecosystem with a description of three species new to science. - Fottea 9(2): 223–232, 2009
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WOJTAL, A.Z.: Nupela marvanii sp. nov., and N. lapidosa (KRASSKE) LANGE–BERTALOT in Poland with notes on the distribution and ecology of the genus Nupela (Bacillariophyta). - Fottea 9(2): 233–242, 2009
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FALASCO, E., BLANCO, S., BONA, F., GOMÀ, J., HLÚBIKOVÁ, D., NOVAIS, M.H., HOFFMANN, L. & ECTOR, L.: Taxonomy, morphology and distribution of the Sellaphora stroemii complex (Bacillariophyceae). - Fottea 9(2): 243–256, 2009
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NOVAIS, M.H., BLANCO, S., HLÚBIKOVÁ, D., FALASCO, E., GOMÀ, J., DELGADO, C., IVANOV, P., ÁCS, É., MORAIS, M., HOFFMANN, L. & ECTOR, L.: Morphological examination and biogeography of the Gomphonema rosenstockianum and G. tergestinum species complex (Bacillariophyceae). - Fottea 9(2): 257–274, 2009
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JAHN, R., KUSBER, W.-H. & ROMERO, O.E.: Cocconeis pediculus EHRENBERG and C. placentula EHRENBERG var. placentula (Bacillariophyta): Typification and taxonomy. - Fottea 9(2): 275–278, 2009
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REICHARDT, E.: New and recently described Gomphonema species (Bacillariophyceae) from Siberia. - Fottea 9(2): 289–297, 2009
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ROTT, E., KOFLER, W. & SCHABETSBERGER, R.: Ultrastructure of a Hyalodiscus species (Bacillariophyceae; Subclass: Coscinodiscophycidae, Fam. Hyalodiscaceae) from brackish waters of Tonga, Oceania. - Fottea 9(2): 299–306, 2009
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VESELÁ, J., NEUSTUPA, J., PICHRTOVÁ, M. & POULÍČKOVÁ, A.: Morphometric study of Navicula morphospecies (Bacillariophyta) with respect to diatom life cycle. - Fottea 9(2): 307–316, 2009
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DENYS, L.: Palaeolimnology without a core: 153 years of diatoms and cultural environmental change in a shallow lowland lake (Belgium). - Fottea 9(2): 317–332, 2009
Abstract | PDF | Supplementary material
PÍŠKOVÁ, A., GRYGAR, T., VESELÁ, J. & OBERHÄNSLI, H. : Diatom assemblage variations in the Aral Sea core C2/2004 over the past two millennia. - Fottea 9(2): 333–342, 2009
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KELLY, M.G., HAIGH, A., COLETTE, J. & Zgrundo, A. : Effect of environmental improvements on the diatoms of the River Axe, southern England. - Fottea 9(2): 343–349, 2009
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HAJNAL, É., STENGER–KOVÁCS, C., ÁCS, É. & PADISÁK, J. : DILSTORE software for ecological status assessment of lakes based on benthic diatoms. - Fottea 9(2): 351–354, 2009
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FRÁNKOVÁ, M., BOJKOVÁ, J., POULÍČKOVÁ, A. & HÁJEK, M. : The structure and species richness of the diatom assemblages of the Western Carpathian spring fens along the gradient of mineral richness. - Fottea 9(2): 355–368, 2009
Abstract | PDF | Supplementary material
Czech Phycological Society/Personalia
List of reviewers Fottea 2007 - 2009
ELIÁŠ, M. & NEUSTUPA, J.: Pseudomarvania, gen. nov. (Chlorophyta, Trebouxiophyceae), a new genus for "budding" subaerial green algae Marvania aerophytica NEUSTUPA et ŠEJNOHOVÁ and Stichococcus ampulliformis HANDA.
Several unicellular green algae exhibit a unique type of cell division, which can be likened to budding. These algae comprise Spongiochrysis hawaiiensis in Cladophorales (Ulvophyceae) and Stichococcus ampulliformis and species of the genus Marvania in the class Trebouxiophyceae. We determined the 18S rRNA gene sequence from Marvania aerophytica NEUSTUPA et ŠEJNOHOVÁ and inferred its phylogenetic position. Our analyses demonstrated that M. aerophytica is unrelated to other species of the genus Marvania (including the type species M. geminata), but together with S. ampulliformis forms a lineage within a broader clade comprising also species of the order Prasiolales, Desmococcus spp., Gloeotilla spp., and non-monophyletic Stichococcus spp. We discuss morphological characteristics of M. aerophytica and S. ampulliformis and based on our results, we propose M. aerophytica and S. ampulliformis be reclassified into a newly established genus of "budding" green algae, Pseudomarvania, as Pseudomarvania aerophytica, comb. nov. and Pseudomarvania ampulliformis, comb. nov.
LANGE-BERTALOT, H., FUMANTI, B., CAVACINI, P. & TAGLIAVENTI, N.: The genus Navigiolum (Bacillariophyceae) in Mediterranean and North African rock pool habitats: description of four new species from Algeria.
Four new species of the recently established genus Navigiolum (Naviculaceae, Bacillariophyceae) are described from samples collected in ephemeral rock pools of Algeria (North Africa). These species are compared with three similar taxa, recently described from comparable habitats in Sardinia (Italy). With a single exception, Navigiolum is currently composed of species that can be considered endemic elements of the circum-mediterranean region and of unusual autecology. They are living in small freshwater pools that are subject to extreme fluctuation. The seven populations and several more from Sardinia and Algeria appear closely related under light microscopy but can be clearly distinguished in the scanning electron microscope. Four new species, Navigiolum marvanii, N. algeriense, N. simplex and N. densistriatum are proposed.
COMPÈRE, P. & VAN DE VIJVER, B.: Planothidium engelbrechtii (CHOLNOKY) ROUND & BUKHTIYAROVA: Identity and lectotypification (Bacillariophyta).
Planothidium engelbrechtii (CHOLNOKY) ROUND et BUKHT. was originally described in 1955 from South Africa as Achnanthes engelbrechtii CHOLNOKY. It became necessary to revise the original type material because of some discrepancies between the original description and figures and the current allotment of this species to the genus Planothidium. The present study confirms the transfer of A. engelbrechtii to Planothidium. A lectotype is designated from Cholnoky’s original material. Valves from the type material are illustrated and discussed by means of LM and SEM micrographs.
HINDÁKOVÁ, A.: On the occurrence of Achnanthes thermalis var. rumrichorum (Bacillariophyceae) in Slovakia.
The cell morphology of Achnanthes thermalis var. rumrichorum Lange-Bertalot, a first record for the territory of Slovakia and in Europe, was studied under LM and SEM and documented by micrographs. This diatom was found in the benthos of a gravel-pit lake in Bratislava and in artificial thermal basins in the health-resort park of Piešťany, Western Slovakia. A discussion of the morphological features of this taxon and their taxonomic affinities with related species is presented.
MANN, D.G., EVANS, K.M., CHEPURNOV, V.A. & NAGAI, S.: Morphology and formal description of Sellaphora bisexualis sp. nov. (Bacillariophyta)
Previous molecular genetic and life cycle studies have revealed the existence of a vigorously homothallic deme within the Sellaphora pupula species complex, which was given the provisional name of Sellaphora [pupula K–LB] Φ ‘urban elliptical’. This is described here as S. bisexualis sp. nov., with a cox1 DNA–barcoded type from Scotland. A detailed description of frustule ultrastructure is given, the most complete for a Sellaphora species. The morphology of the terminal raphe fissure is variable, becoming vestigial in some small pre–auxospore valves, and the boundary between the raphe-sternum and striae is sometimes strongly, sometimes weakly marked by larger areolae and an external groove. The cingulum contains at least three plain bands. The pars interior of band 1 (the valvocopula), as well as being undulate with a pitch corresponding to the transapical ribs, bears a very fine fringe of short fimbriae. Sexual reproduction involves ‘male’ and ‘female’ gametangia, as in other allogamous species of Sellaphora, but in S. bisexualis cells of the same clone can differentiate into either sex, allowing homothallic reproduction and successive inbred generations. The proven distribution of the species includes sites in the UK and Australia.
MANN, D.G. & POULÍČKOVÁ, A.: Incunabula and perizonium of Neidium (Bacillariophyta).
The incunabula and perizonium of a paedogamous Neidium deme (in the N. ampliatum species complex) are described in detail using light and scanning electron microscopy. The incunabula contain two types of element, both heavily silicified. At each pole of the ellipsoidal zygote there is a large cap, which almost abuts its twin on either side of the zygote, beneath the gametangial valves. The caps are deeply and widely notched on their ‘girdle’ sides (i.e. on the sides of the zygote that underlie the gametangial girdle) and the space created by the notches is filled by large, almost triangular incunabular plates. Thus, on each side of the equator of the zygote there is one cap element and two plate elements. The caps overlap the plates and must precede them ontogenetically, creating a polarity opposite to that of the transverse perizonium. Both elements are sparsely and irregularly porous and have fimbriate margins. During auxospore expansion, the two sets of incunabular elements separate at the equator of the cell and the transverse perizonium is formed beneath, the incunabula continuing to form a tight seal around the perizonium and apparently constraining development to form a linear tube. All transverse perizonial bands possess delicate fimbriae and are open, even the primary band, which is slightly wider than the bands on either side and bears a median ridge. The open ends of the secondary bands sweep strongly towards the centre of the auxospore, producing a very obvious and wide suture. In expanded auxospores, a robust longitudinal band is found beneath the suture, which has coarser fimbriae than the transverse bands. Possible interpretations of the incunabular elements are discussed: no structures similar to the incunabular plates have been described in other diatoms, but it is known that related genera (Biremis, Muelleria) also have large cap-like elements in their incunabula. The open nature of the primary transverse perizonial band is unusual in raphid diatoms, but auxospore coverings have been investigated ultrastructurally in too few diatoms to permit detection of evolutionary trends.
KULIKOVSKIY, M., LANGE–BERTALOT, H., WITKOWSKI, A. & DOROFEYUK, N.: Morphology and taxonomy of selected cymbelloid diatoms from a Mongolian Sphagnum ecosystem with a description of three species new to science.
The present paper focuses on selected cymbelloid diatom taxa inhabiting Nur Sphagnum bog in northern Mongolia. Samples collected in this area contained numerous species of Encyonema KÜTZING and Cymbopleura (KRAMMER) KRAMMER, that are together acidobiontic, oligotraphentic taxa. Cymbopleura pernaviculiformis, Cymbopleura deviatkinii and Encyonema marvanii are described as species new to science. Furthermore, for two other species we suggest new nomenclatural combinations. The characteristics of Cymbopleura naviculiformis (AUERSWALD) KRAMMER sensu stricto are discussed in order to compare it with other species mentioned in this paper. The autecological characteristics of the new species found in Nur bog are presented.
WOJTAL, A.Z.: Nupela marvanii sp. nov., and N. lapidosa (KRASSKE) LANGE–BERTALOT in Poland with notes on the distribution and ecology of the genus Nupela (Bacillariophyta).
Two species of Nupela were identified in a spring and in a small spring-fed pool in the Polish Tatra Mts, - these were N. lapidosa and Nupela sp. The second species is described as N. marvanii. The new species is characterized by heteropolar, narrowly elliptic valves with capitate apices. Sternum valve has very short, sometimes rudimental raphe branches. Under a light microscope transapical striae are not discernible. Externally both valves are covered with hymen. The central area of sternum valves has irregular silicate thickenings. Proximal raphe fissures are straight and terminate in small pores. Distal raphe fissures double–deflected into the same side of the valve, form ?–shaped structures that extend onto the mantle. Internally visible linear-lanceolate axial area, which forms unilateral fascia on raphe valve, which reaches valve margin. Proximal raphe fissures are T–shaped. Distal raphe fissures are straight, and terminate in small, linear helictoglossa. Sternum valve has large, clearly visible internally, asymmetrically lanceolate central area and discernible externally reinforced median costa. Raphe fissures are strongly reduced, rudimental. The areole are round to elliptical, expanded along the transapical axis, with the wider opening on the external surface. An irregular row of similar areoles is present along pleural side of valve. Both species are documented with LM and SEM micrographs and briefly discussed. The distribution and autecology of 46 Nupela members are summarized.
FALASCO, E., BLANCO, S., BONA, F., GOMÀ, J., HLÚBIKOVÁ, D., NOVAIS, M.H., HOFFMANN, L. & ECTOR, L.: Taxonomy, morphology and distribution of the Sellaphora stroemii complex (Bacillariophyceae).
Live and treated materials from three populations of diatoms collected in Italy, Slovakia and Spain, identified in previous inventories as Navicula stroemii HUST. sensu KRAMMER et LANGE–BERTALOT, were examined under light and scanning electron microscopy. The analyses highlighted the typical single H–shaped plastid, characteristic of the genus Sellaphora. Considering this, we thoroughly investigated type materials from the Sellaphora stroemii complex. According to the standard European diatom flora of KRAMMER & LANGE–BERTALOT (1986: Süßwasserflora von Mitteleuropa 2/1), six species should be considered as taxonomic synonyms of Navicula stroemii, now Sellaphora stroemii (HUST.) H. KOBAYASI in MAYAMA et al.: Navicula aggerica E. REICHARDT, N. rivularis HUST., N. subbacillum HUST., N. subcontenta WILLI KRIEG., N. vasta HUST. and N. ventraloides HUST. The type materials of these species were examined using both light and scanning electron microscopy and geometric morphometric analysis. The analysis of the valve ultrastructure demonstrated the affiliation of Navicula aggerica, N. subbacillum, N. vasta and N. ventraloides to the genus Sellaphora. A Principal Component Analysis based on the shape of the valve outline, allowed us to define the European taxa Sellaphora stroemii, S. ventraloides and S. aggerica as three separated taxa, clearly distinct from the Indonesian diatom Sellaphora subbacillum, comb. nov. Moreover, considering the need of a replacement name for Navicula subcontenta (KRIEGER 1943), already validly published by HUSTEDT in 1942, we propose the new name Navicula petrmarvanii nom. nov. for KRIEGER’s species.
NOVAIS, M.H., BLANCO, S., HLÚBIKOVÁ, D., FALASCO, E., GOMÀ, J., DELGADO, C., IVANOV, P., ÁCS, É., MORAIS, M., HOFFMANN, L. & ECTOR, L.: Morphological examination and biogeography of the Gomphonema rosenstockianum and G. tergestinum species complex (Bacillariophyceae).
The type material of Gomphonema rosenstockianum LANGE–BERT. et E. REICHARDT from La Gomera (Canary Islands, Spain) and epilithic material of rivers from several European countries were examined using light and scanning electron microscopy in order to improve the knowledge on the taxonomical status of the G. rosenstockianum and G. tergestinum (GRUNOW) M. SCHMIDT species complex. Two other Gomphonema species, G. supertergestinum E. REICHARDT and G. angustius E. REICHARDT, recently described and belonging to the same group, are also presented in detail. After the analysis of several populations of G. rosenstockianum and G. tergestinum it was possible to define several reliable criteria to allow morphological differentiation of both species under LM and SEM as well. A geometric morphometric analysis clearly demonstrated the separation of these taxa considering valve outline, size and shape of the central area and position of the stigma. Apart from the morphological analysis, compilation of the results of this study has also revealed differences in ecological preferences of the two species. World and European distribution maps of the four Gomphonema taxa are presented.
JAHN, R., KUSBER, W.-H. & ROMERO, O.E.: Cocconeis pediculus EHRENBERG and C. placentula EHRENBERG var. placentula (Bacillariophyta): Typification and taxonomy.
The nominate varieties of the monoraphid diatoms Cocconeis pediculus EHRENBERG and C. placentula EHRENBERG are typified. Discrepancies from common concepts in Ehrenberg’s types, habitats and descriptions were discovered which might affect our current understanding of both Cocconeis species. To ensure stabilization of names and concepts for these two taxa, epitypes from a location in Berlin close to the locus typicus are presented. Monoclonal cultures of these two taxa have been established. Morphological and morphometric data from clones as well as from populations for both taxa are presented. The taxonomy of C. pediculus and C. placentula var. placentula is discussed and evaluated in the context of historical and recent publications.
REICHARDT, E.: New and recently described Gomphonema species (Bacillariophyceae) from Siberia.
This paper reports on five species of the genus Gomphonema, which seem to be widespread at least in Siberia or in other regions, too. Due to their wide distribution their knowledge is of special importance. Three species are described as new (G. demersum, G. jergackianum and G. marvanii) based on light– (LM) and scanning electron microscopical (SEM) investigations. Important characters delimiting these species from similar taxa are discussed. For two recently described species (G. liyanlingae METZELTIN et LANGE–BERTALOT and G. khentiiense METZELTIN, LANGE–BERTALOT et NERGUI) ultramicroscopical details or SEM micrographs are presented for the first time and additional data on their distribution are given.
ROTT, E., KOFLER, W. & SCHABETSBERGER, R.: Ultrastructure of a Hyalodiscus species (Bacillariophyceae; Subclass: Coscinodiscophycidae, Fam. Hyalodiscaceae) from brackish waters of Tonga, Oceania.
A rarely recorded centric diatom of the genus Hyalodiscus was found in three mixed freshwater and brackish environments of Tonga. Both classical morphological and scanning electron microscopic features were used to classify the taxon within currently know taxa from inland and brackwater sites. We recorded stable ultrastructural features (e.g. type of poroids, type and arrangement of rimoportulae) but also several variable morphological features (mainly outline, diameter and structure of the umbilicus and nodulation within the umbilicus centre) as well as variable ultrastructural features (margin of central area; central termination of striae). The loculate nature of puncta closed by rotae and the small fultoportulae potentially typical features for the genus was confirmed. The taxon showed a high similarity to Hyalodiscus lentiginosus JOHN 1982 described from Swan river estuary Australia with the exception of more variable punctation in the central umbilicus area and different variability of central noduli. We also checked for identical features (size, central area) with Hyalodiscus withneyi described by EHRENBERG 1870 from near Great Salt Lake Utah.
VESELÁ, J., NEUSTUPA, J., PICHRTOVÁ, M. & POULÍČKOVÁ, A.: Morphometric study of Navicula morphospecies (Bacillariophyta) with respect to diatom life cycle.
Quantitative and qualitative variation in valve morphology in strains of Navicula cryptocephala and N. trivialis were examined using conventional valve measurements (length, width, striae density) and landmark-based geometric morphometric method. The ability of morphometric techniques to distinguish individual strains on the basis of postinitial and/or sexually competent cells was assessed by multivariate analyses and permutation tests. The data showed that each strain had unique valve characters, which were shared by both large postinitial and small sexually competent cells. Landmarks representing central area and apical ends of the valves were primarily the most useful for discrimination between strains. The geometric morphometric techniques appeared to be enough sensitive to distinguish subtle morphological differences between Navicula morphospecies clonal cultures withouth any interference of diatom life cycle stage.
DENYS, L.: Palaeolimnology without a core: 153 years of diatoms and cultural environmental change in a shallow lowland lake (Belgium).
Time series of diatom assemblage composition can be obtained from samples of various collection materials. This allows assessment of ‘more natural’ conditions and their temporal variability in shallow lakes and ponds, similar to traditional core–based palaeolimnology. Such information is useful to underpin restoration targets that are ecologically relevant and that conform to legal requirements posed by the European Water Framework Directive. Using sediment samples from herbarium macrophytes and other sources, historical conditions are documented for a shallow man-made soft–water lake in lower Belgium (Kraenepoel, Aalter). Both assemblage composition and diatom-inferred water chemistry varied considerably from 1853 to the first half of the 20th c. The lake was used for pisciculture during this time. From this situation, two alternatives are envisaged to determine the lake’s ecological potential, depending on whether it is kept hydrologically isolated or reconnected to the brook that supplied its water originally. Later in the 20th c., inflow of polluted water and altered management caused considerable eutrophication up to the time when restoration measures were undertaken (1999–2002). Since then both diatom-inferred and measured physical-chemical conditions have improved considerably, even to the point of approaching those in the early 20th c. Post-restoration sediment assemblages reflect some functional and structural rehabilitation of the lake ecosystem, but return to a former species composition was limited. The most recent observations (2006) suggest a possible reversal of the recovery process warranting further vigilance. The potential of using sediment assemblages for monitoring lentic water bodies is highlighted.
PÍŠKOVÁ, A., GRYGAR, T., VESELÁ, J. & OBERHÄNSLI, H. : Diatom assemblage variations in the Aral Sea core C2/2004 over the past two millennia.
This study assesses changes in the environmental conditions in Chernyshov Bay (northern part of Aral Sea Western Basin) during the last ~2 ky from geochemical and diatom analyses of sediment core C2/2004. Comparison of fossil assemblages with the contemporary distribution of diatoms in the Aral Sea suggests that considerable changes occurred in water level as well as salinity. Deposits with high diatom concentrations and dominance of the marine species Actinocyclus octonarius EHRENBERG are interpreted as periods of high water level, whereas replacement by Tryblionella compressa (BAILEY) BOYER is considered to indicate lake level fall. On the other hand sediments with low diatom concentration represent higher freshwater input and therefore salinity decrease. This interpretation is supported by estimates of siliciclastic and chemogenic sediment components. A chronology of major lake stages is derived and roughly agrees with recent findings from other studies.
KELLY, M.G., HAIGH, A., COLETTE, J. & Zgrundo, A. : Effect of environmental improvements on the diatoms of the River Axe, southern England.
The River Axe, a lowland river in South–west England is used as a model system for describing how ecological status assessments can be applied in practice. Seasonal sampling over a three–year period established a strong baseline against which future changes could be assessed. These indicated that the river was enriched with nutrients and that ecological status was significantly below the good/moderate status boundary, implying the need for a Programme of Measures to be implemented. Reductions in both point and diffuse sources of nutrients led to changes in the diatom assemblage, reflected by increasing EQRs at monitored sites. An understanding of the uncertainty inherent in diatom–based ecological status assessments allows the success of control measures to be assessed. In the case of the River Axe, diatom-based assessments suggest that the river is now close to good status at many monitored sites, although there is still evidence of some nutrient enrichment.
HAJNAL, É., STENGER–KOVÁCS, C., ÁCS, É. & PADISÁK, J. : DILSTORE software for ecological status assessment of lakes based on benthic diatoms.
Until recently, only few diatom indices were developed for monitoring littoral zones of lakes. The available indices are not applicable for all lake types because species lists and environmental constraints’ ranges are different. So far, four diatom indices (SCIL, TDIL, S, TI) were developed that use attached diatoms for ecological status assessment therefore a need arose to ease index calculation similarly as it is a wide spread practice in status assessment of rivers by means of the well known OMNIDIA software. DILSTORE 1.1 software has three main functions; (i) calculation of diatom indices and community attributes; (ii) storage and listing of primary diatom data series and (iii) it contains a taxon name coder and a spelling-check program. It can be used as a peripheral aid to generate data sheets for the OMNIDIA. The DILSTORE 1.1 software was developed for IBM PC compatible computers, for Windows users. According to the experiences, the DILSTORE 1.1 software can make the regular lake monitoring practice considerably faster.
FRÁNKOVÁ, M., BOJKOVÁ, J., POULÍČKOVÁ, A. & HÁJEK, M. : The structure and species richness of the diatom assemblages of the Western Carpathian spring fens along the gradient of mineral richness.
Species composition changes along the pH and calcium gradients within wetlands were frequently studied for different groups of organisms, but few data are available for algae. Here we list 188 diatom taxa collected as epibryon and epipelon at 13 spring fens in the Western Carpathians distributed along the gradient of mineral richness. Species richness decreased along the gradient from calcareous fens to mineral–poor Sphagnum–fens. In agreement with fen typology based on higher plants, bryophytes, and molluscs, the same four fen types were identified. For each spring-fen type indicator diatom species were suggested. Conductivity and pH appeared to be the most important environmental factors responsible for the variation in diatom species data.