title: Petalonema
text: # 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
  