Fottea, 2010 (vol. 10), issue 2

A taxonomical study of Rhoicosphenia Grunow (Bacillariophyceae) with a key for identification of selected taxa.

Zlatko Levkov, Katarina Caput Mihalić, Luc Ector

Fottea 10(2): 145-200, 2010 | 10.5507/fot.2010.010  

A taxonomical study of 15 Rhoicosphenia species based on light and scanning electron microscope was performed. The genus Rhoicosphenia is characterized by frustule heterovalvy, with a fully developed raphe on the concave valve (referred also as R valve) and reduced raphe on the convex valve (referred as D-valve). One of the most frequently reported species, R. abbreviata, is characterized by narrow, linear valves with low stria density. In contrast, Rhoicosphenia macedonica has broadly clavate valves with a high stria density. According to valve shape R. macedonica is similar to the widely distributed marine species...

Examination of the terrestrial algae of the Great Smoky Mountains National Park, USA.

Liliya S. Khaybullina, Lira A. Gaysina, Jeffrey R. Johansen, Markéta Krautová

Fottea 10(2): 201-215, 2010 | 10.5507/fot.2010.011  

Forest soils of the Great Smoky Mountains National Park were examined for soil algae as part of the All Taxa Biodiversity Inventory underway in that park. Soils of both mature and secondary growth forests were sampled, along with samples from rocks and tree bark. A total of 42 taxa were observed, representing Cyanobacteria (3 species), Chlorophyceae (12 species), Trebouxiophyceae (18 species), Ulvophyceae (3 species), Klebsormidiophyceae (1 species), Zygnematophyceae (2 species), Tribophyta (3 species), Eustigmatophyta (1 species), Euglenophyta (1 species), and Dinophyta (1 species). Twenty new taxa records for the park were established.

Two form-genera of aerophytic heterocytous cyanobacteria from Brasilian rainy forest "Mata Atlântica".

Celia Leite Sant'Anna, Tereza M.P. Azevedo, Jan Kaštovský, Jiří Komárek

Fottea 10(2): 217-228, 2010 | 10.5507/fot.2010.012  

Two specific and characteristic morphotypes of the cyanobacterial heterocytous and heteropolar genera from the family Microchaetaceae were recognized in subaerophytic, epiphytic, epidendric and soil habitats in Brasilian rainy forest "Mata Atlântica". The modern taxonomy of cyanobacteria is based mainly on molecular sequencing; the both new types were not yet cultured and their genetic relations must be solved in future. However, they can not be included in any generic unit supported by genetic methods and correspond morphologically to quite special and phenotypically yet unknown generic entities. Therefore, new form-genera Ophiothrix and Streptostemon...

Cytomorphology of six halotolerant coccoid cyanobacteria using DAPI fluorescent and transmission electron microscopy, compared with molecular data.

Vladislav Cepák, Jiří Komárek

Fottea 10(2): 229-234, 2010 | 10.5507/fot.2010.013  

Cytomorphological characters of six strains of unicellular cyanophytes, all belonging to "Euhalothece/Halothece" group in the sense of Garcia-Pichel et al. (1998), but of different hypersaline origin, have been studied using DAPI fluorescent staining and light and transmission electron microscopy. They can be divided into two clades, which are well separated according to phenotypic taxonomy (morphology, cytology and ultrastructure). The first group (four strains) could be included in the subcluster "Euhalothece" (on the generic level, but not yet validly described). Broad oval cells of ca 4-6 μm breadth with indistinct chromatoplasm,...

Anabaena fuscovaginata (Nostocales), a new cyanobacterial species from periphyton of the freshwater alkaline marsh of Everglades, South Florida, USA.

Jan Mareš

Fottea 10(2): 235-243, 2010 | 10.5507/fot.2010.014  

A new species of the nostocalean genus Anabaena was discovered in periphytic cyanobacterial mats of the Everglades marsh, South Florida, USA. In some of the 10 samples where it occurred, the species dominated the cyanobacterial community, however, it was always part of a rich assemblage of microbiota, including many types characteristic for alkaline herbaceous wetlands of Caribbean America or freshwater tropical marshes. On the basis of typical morphological traits and occurrence in a periphytic habitat, I suggest that the species is a member of the genus Anabaena in its original sense, valid after recent separation of planktic taxa. As the...

The list of cyanobacterial species of the Czech Republic to the end of 2009.

Jan Kaštovský, Tomáš Hauer, Jiří Komárek, Olga Skácelová

Fottea 10(2): 245-249, 2010 | 10.5507/fot.2010.015  

This article summarizes up to date knowledge of occurrence of Cyanobacteria in the Czech Republic; abundance and ecological characteristics are provided for each species. The list does not contain non-verified findings and questionable or unclear taxa, names of the species and synonymy is in agreement with modern nomenclatural system. Based on these criteria, a total of 505 species have been recorded for the area since 1892, whereas occurrence of only 392 species is known recently. This indicates clear trend towards the decrease of the number of the taxa. Most of the extinct and potentially endangered species are likely of the oligotrophic standing...

Heterothallic and homothallic sexual reproduction in Tabularia fasciculata (Bacillariophyta).

Nickolai A. Davidovich, Irena Kaczmarska, James M. Ehrman

Fottea 10(2): 251-266, 2010 | 10.5507/fot.2010.016  

Sexual behaviour, pattern of auxosporulation, and breeding system of the araphid diatom Tabularia fasciculata were studied using 64 clones derived from two natural populations from the Canadian Atlantic seashore and the Black Sea. Both inter- and intraclonal reproductions were observed. Heterothallic reproduction was morphologically and behaviourally heterogamous. The heterothallic nature of sexual reproduction in this species allowed the determination of sex ratio in the population, which was 1:1 male:female. A novel type of active movement of gametes designated as male was described and pathways traced and recorded. A few male clones could...