Fottea, 2021 (vol. 21), issue 2
Original article
Analysis of some species resembling Fragilaria capucina (Fragilariaceae, Bacillariophyta)
Bart Van de Vijver, David M. Williams, Martyn Kelly, Amelie Jarlman, Carlos E. Wetzel, Luc Ector
Fottea 2021, 21(2):128-151 | DOI: 10.5507/fot.2021.001 
Based on literature data, Fragilaria capucina seems to be a widespread species, often split into a large number of varieties. In the present study, the original type material was investigated, together with the type material of two varieties, originally described by Grunow as the var. acuta and the var. acuminata and the type material of Fragilaria sandellii and F. nevadensis. The results of all morphological analyses indicated that F. capucina is clearly different from the other species based on the number of rimoportulae, valve outline and spine morphology. The var. acuta and var. acuminata...
Nupela semifasciata (Bacillariophyceae), a new species from subtropical lotic environments in Western Paraná State, Brazil
Mailor Wellinton Wedig Amaral, Gabriela Medeiros, Vanessa Daufenbach, Morgana Suszek Gonçalves, Thelma Alvim Veiga Ludwig, Norma Catarina Bueno
Fottea 2021, 21(2):152-163 | DOI: 10.5507/fot.2021.002
During a survey on freshwater epilithic diatoms from subtropical lotic environments belonging to the Cascavel River microbasin, Paraná State, Brazil, we observed populations of a new Nupela Vyverman et Compère species. Morphological and meristic analyses were performed using light and scanning electron microscopy, resulting in the description of Nupela semifasciata sp. nov. This species is characterized by elliptic-lanceolate valves containing subcapitate apices in larger individuals and broadly rostrate-rounded apices in smaller ones, while the length/width ratio gradually decreases as the individuals become smaller. The central...
Studies on type material from Kützing's diatom collection III: Synedra splendens (Kütz.) Kütz., Synedra aequalis (Kütz.) Kütz. and a note on Synedra obtusa W.Sm.
David M. Williams, Bart Van de Vijver
Fottea 2021, 21(2):164-179 | DOI: 10.5507/fot.2021.004
Examination of type material for Ulnaria splendens, Ulnaria aequalis and Ulnaria obtusa provides evidence to support each as a distinct and definable taxon. None can be considered more closely related to any other species in the genus Ulnaria and are therefore all recognised at the same rank, that of species. We briefly discuss five further taxa that involve the name Synedra splendens: Synedra splendens var. marina, Synedra splendens var. salina, Synedra splendens var. brevis, Synedra splendens var. subspathulata and Synedra (ulna...
A review of Tabellaria species from freshwater environments in Europe
David Heudre, Carlos E. Wetzel, Horst Lange-Bertalot, Bart Van de Vijver, Laura Moreau, Luc Ector
Fottea 2021, 21(2):180-205 | DOI: 10.5507/fot.2021.005
The diatom genus Tabellaria Ehrenberg is one of the most widely distributed genera in freshwaters, both in benthos and phytoplankton. It is rather frequent in unpolluted, circumneutral to slightly acidic and poorly mineralized lakes, streams and peat bogs. Despite being studied intensively in the last decades, the taxonomy of this genus is still unsatisfactory as some authors recently proposed to consider most species as synonyms of Tabellaria flocculosa (Roth) Kützing. Several dozen of Tabellaria rich samples from Europe were investigated and six were selected to illustrate typical populations. Five new species are described based...
New species of Iconella Jurilj (Bacillariophyta) from tropical areas of China
Yan Liu, Ziyi Jiang, John Patrick Kociolek, Xinxin Lu, Yawen Fan
Fottea 2021, 21(2):206-219 | DOI: 10.5507/fot.2021.006
Three distinctive species of the diatom genus Iconella Jurilj were described from tropical areas of China. These new species all have the canal raphe extending around valve margins, keel raised off the valve surface forming wings, fenestrae obvious and alar canals that are uniformly porous. Together these features suggest these species should be assigned to the newly re-established genus Iconella. Here we describe Iconella shiwana Yan Liu, Ziyi Jiang et Kociolek sp. nov., Iconella pseudoconstricta Yan Liu, Ziyi Jiang et Kociolek sp. nov. and Iconella uniformis Yan Liu, Ziyi Jiang et Kociolek sp. nov., all described...
Three new species of the genus Stauroneis Ehrenberg (Bacillariophyceae: Stauroneidaceae) from the Northern Western Ghats, India
Neha Wadmare, John Patrick Kociolek, Balasubramanian Karthick
Fottea 2021, 21(2):220-234 | DOI: 10.5507/fot.2021.007
Three new species of the genus Stauroneis Ehrenberg are discovered from the Northern Western Ghats of India - Stauroneis datarii sp. nov., Stauroneis bahlsii sp. nov., and Stauroneis hamiltonii sp. nov. Based on light microscopy (LM) and scanning electron microscopy (SEM) observations, detailed morphological features are presented and each taxon is discussed in comparison with similar species within the genus. Features of linear-lanceolate valves with median constriction, rounded apices, bow-tie shaped stauros, and radiating striae characterize Stauroneis datarii. Stauroneis bahlsii has large, lanceolate valves,...
Multiple phylogenies reveal a true taxonomic position of Dulcicalothrix alborzica sp. nov. (Nostocales, Cyanobacteria)
Bahareh Nowruzi, Sergei Shalygin
Fottea 2021, 21(2):235-246 | DOI: 10.5507/fot.2021.008
A new species of heterocytous cyanobacterium Dulcicalothrix alborzica sp. nov. (Calotrichaceae) was isolated from Iran and described following a polyphasic approach. Morphological examination indicated that the strain, initially called "Alborzica", belonged to the genus Calothrix. Nonetheless, 16S rRNA gene analysis showed that "Alborzica" were within the Dulcicalothrix cluster. In order to confirm the taxonomic position of this new taxon, rbcL and rpoC1 phylogenies were inferred. Results confirmed identity of "Alborzica" supporting the 16S rRNA phylogeny. Analysis of the secondary structures of 16S-23S Internal Transcribed Spacer...
Taxonomy and nomenclature of some members within the Obtusae section of Nitzschia Hassall (Bacillariophyceae) including descriptions of two new species
Sarah E. Hamsher, J. Patrick Kociolek, Sarah A. Spaulding, Amal I. Saleh
Fottea 2021, 21(2):247-258 | DOI: 10.5507/fot.2021.010
Light and scanning electron microscope observations are made on some members of the section Obtusae in the genus Nitzschia (Bacillariales, Bacillariophyceae). We use type and other material derived from both the National Water Quality Assessment (NAWQA) program in the USA and from Egypt to assess five different taxa, two of which are described as new to science (Nitzschia lowei, sp. nov., Nitzschia potapovae, sp. nov.) and another is made as a new nomenclatural combination (Nitzschia kurzeana var. multistriata (Hohn) comb. nov.). Other names used in the literature for some of these taxa are considered and discussed....
Description of two new species of Nostoc from China based on the polyphasic approach
Fangfang Cai, Gongliang Yu, Yuchen Liu, Yuanquan Sun, Renhui Li
Fottea 2021, 21(2):259-271 | DOI: 10.5507/fot.2021.011
The present study described two new Nostoc species, Nostoc favosum (CHAB5709, CHAB5713, and CHAB5714) and Nostoc mirabile (CHAB5756 and CHAB5784) based on the polyphasic approach combining morphological, genetic and ecological characteristics. Five investigated strains were found to possess morphological features of the Nostoc genus. Results showed that the 16S rRNA gene sequences of these five strains displayed ≥ 95%, and ≤ 98% similarity to the genus Nostoc. The 16S rRNA gene phylogenetic analysis inferred using bayesian inference, maximum-likelihood and neighbour-joining methods placed these five strains...
Review
Underestimated cyanobacterial diversity: trends and perspectives of research in tropical environments
Petr Dvořák, Petr Hašler, Dale A. Casamatta, Aloisie Poulíčková
Fottea 2021, 21(2):110-127 | DOI: 10.5507/fot.2021.009
Cyanobacteria are photo-oxygenic prokaryotes present in nearly all ecosystems, where they are important in global oxygen, carbon, and nitrogen cycles. They are often recognized as the harbingers of eutrophication in freshwater systems and are increasingly being noted as nuisance species in marine ecosystems such as coral reefs. In recent years, cyanobacteria have been intensely studied due to their toxicity, harmful bloom formation, and because their distribution and abundance are expected to increase with climate change. Nevertheless, for all of their importance, many gaps in our knowledge of cyanobacteria remain: the distribution, dispersal, and...
Personalia
Anniversary of prof. RNDr. Jiří Komárek, DrSc.
Jan Kaštovský
Fottea 2021, 21(2):i-ii
Jiří Komárek was born on 28 May 1931 in Brno. He started his studies at the Faculty of Science, Masaryk University in Brno (1949 - 1951) and then, during the years 1951 - 1957, he continued with his postgraduate studies at the Faculty of Science, Charles University under the guidance of another legend of world algology, professor Bohuslav Fott.
Anniversary of prof. RNDr. Aloisie Poulíčková, CSc.
Petr Dvořák, Petr Hašler
Fottea 2021, 21(2):iii-iv
Aloisie Poulíčková (*1961) alias Alka has started with microalgal research in 1977 as a student of grammar school (gymnasium) in Zlín. The first person who attracted Alka to the algal world was her teacher of biology RNDr. J. Pásek, although it happened by chance. Dr. Pásek was a mineralogist and leader of the biological student club in the gymnasium. After receiving a letter written by Czech phycologists to support phycology at grammar schools he met Alka on the school corridor and asked her. „In what part of biology are you interested?“ She answered: „Spiders“ He stroked his beard in a short meditation, gave her a letter,...