Cylindrospermum longisporum Komárek

Komárek, J. (2012). Nomenclatural changes in heterocytous Cyanoprokaryotes (Cyanobacteria, Cyanophytes). Fottea 12(1): 141-148. http://fottea.czechphycology.cz/_contents/F12-1-2012-11.pdf
Filaments solitary or in microscopic colonies. Trichomes ± straight or slightly flexuous, cylindrical, not attenuated at the ends, constricted at cross–walls. Cells cylindrical, clearly longer than wide, pale blue–green or yellowish, usually keritomized, 4–11 × ± 3 µm. Terminal cells cylindrical and rounded at the end. Heterocytes terminal, cylindrical or long–ovoid, 11–17 × 4.5–6 µm. Akinetes cylindrical, solitary, with smooth colourless exospore, 24–43 × 7–10.6 µm. – In marshes and wet meadows, partly submersely; orig. locality: Czech Republic, South Bohemia, meadows near the pond Řežabinec.