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Scientific classification
Domain: Bacteria
Phylum: Cyanobacteria
Order: Pleurocapsales
Family: Pleurocapsaceae
Genus: Radaisia
Sauvageau, 1895

See text.

Radaisia is a genus of coccoid cyanobacterium comprising about 10 identified species.[1] It is a colonial cyanobacterium, the bacteria initially forming a round to irregularly shaped flat group of gelatinous or crustose cells attached to the substrate from which arise rows of pseudofilamentous cells in mucilagionous sheaths perpendicular to the initial colony.[1][2] Apical cells of the pseodofilamentous sheaths are elongate compared to proximal cells in the sheath.[1] Cell division in the genus is notably irregular, although usually perpendicular to the axis in the pseudofilament.[1] The cells are light blue-green to reddish purple in color.[1]


Some species currently in this genus include:

  • R. clavata
  • R. confluens
  • R. epiphytica
  • R. gardneri
  • R. gomontiana
  • R. pusilla
  • R. violacea
  • R. willei


  1. ^ a b c d e Sheath, Robert G.; John D. Wehr (2003). Freshwater algae of North America: ecology and classification. Boston: Academic Press. pp. 108–110. ISBN 0-12-741550-5. 
  2. ^ Khattar, JIS; Singh, DP; Kaur, Gurpreet (2009). Algal Biology and Biotechnology. I K International Publishing House. ISBN 978-93-8002-619-0. 
  • Guiry, M.D.; Guiry, G.M. (2008). "Radaisia". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Retrieved 2009-06-24.