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...