Fottea - Ahead of Print
Pushkarnema curajae gen. et sp. nov. (Nodosilineales), a novel filamentous cyanobacterium isolated from a freshwater reservoir of northwest India
Sonam Sonam, Anuj K. Tomer, Dale A. Casamatta, Pawan K. Dadheech
Fottea X:X | DOI: 10.5507/fot.2025.010 
During the exploration of cyanobacterial diversity of the semi-arid region of northwest India, a non-heterocytous cyanobacterium was isolated from an aquatic habitat and characterized using a polyphasic approach based on morphology, ecology and sequencing of the 16S rRNA gene. Two strains (AT2016/6; SN2021/02) were isolated and characterized by cells longer than wide, the presence of a thick sheath, and the formation of nodules. 16S rRNA gene sequences revealed that the strains formed a highly supported, distinct clade within the Nodosilineales, ranging from 89.52% to 92.76% similarity to other strains. Secondary structures (the D1-D1´, BoxB, and V3...
Revision of the genus Stauroforma (Staurosiraceae, Bacillariophyceae) based on varieties of Fragilaria virescens described by Albert Grunow
Bart Van de Vijver, Tanja M. Schuster, David M. Williams, Wolf-Henning Kusber
Fottea X:X | DOI: 10.5507/fot.2025.011
A revision of the genus Stauroforma is proposed based on the analysis of several historic slides prepared by Grunow to describe Fragilaria virescens var. exigua. The original materials are analysed using both light and scanning electron microscopy together with a critical examination of the original drawings and notes Grunow made on his new taxa. Based on this, the genus description of Stauroforma is emended and the morphological descriptions of S. exiguiformis and S. inermis are updated. Grunow's variety subsalina is raised to species level as Stauroforma subsalina. A new species,...
Parabrasilonema hainanensis gen. et sp. nov. (Scytonemataceae, Nostocales), a novel filamentous cyanobacterium isolated from a tropical reservoir in China
Qi Zhang, Lin Li, Tianli Li, Lingling Zheng, Lirong Song
Fottea X:X | DOI: 10.5507/fot.2025.012
A filamentous, heterocytous cyanobacterial strain FACHB-3638 was isolated from Yongzhuang Reservoir, a tropical drinking water reservoir on Hainan Island, southern China. This cyanobacterium formed macroscopic, felt-like mats on submerged concrete substrates, covering extensive areas of the shallow riverbed. The filaments were isopolar, cylindrical, and nearly straight or flexuous, exhibiting infrequent scytonematoid false-branching and producing firm, often layered and colored sheaths. Morphologically, the strain resembles members of the Scytonemataceae family, particularly Brasilonema, but phenotypically differed from other scytonematoid genera...
Morphology, taxonomy and epitypification of Eaprasiola yunnanica (C.-C.-Jao) comb. nov. (Prasiolaceae, Trebouxiophyceae) from China using reverse and integrative approaches
Feilong Su, Yukang Liu, Qingyu Dai, Benwen Liu, Guoxiang Liu, Huan Zhu
Fottea X:X | DOI: 10.5507/fot.2025.013
The Prasiola-like Prasiolaceae includes some 35 species of monostromatic green algae found in a wide range of habitats, including marine, freshwater, and terrestrial environments, across polar, cold, temperate, and subtropical regions. They exhibit considerable phenotypic plasticity, complicating identification based on morphology alone. Here, we used a approach based on full-length 18S rDNA amplicon sequencing to identify Prasiola-like specimens from China. Amplicon sequence variants (ASV) belonging to Prasiolaceae were detected in material collected at W'umonshan, Yunnan Province, China, and living specimens were subsequently collected...