Petalonema

Petalonema is a genus of cyanobacteria. These species occur in freshwater habitats, on rocks, in soil, and as epiphytes.

Species include:
 * Petalonema alatum
 * Petalonema crassum
 * Petalonema crustaceum
 * Petalonema densum
 * Petalonema fluminalis
 * Petalonema incrustans
 * Petalonema involvens
 * Petalonema pulchrum
 * Petalonema velutinum