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Name derivation:

From the Greek hapalos, soft, tender, and siphon, a tube


Hapalosiphon  Nägeli ex Bornet and Flahault  1886;  15 of 77 species descriptions are currently accepted taxonomically (Guiry and Guiry 2013).

Order Nostocales;  Family Hapalosiphonaceae



Uniseriate trichomes within colorless sheaths arranged in coiled clusters that initially grow attached to substrates and later are found floating among other vegetation.


Similar genera:



In the littoral zones of lakes and swamps.



Bornet, É. and C. Flahault  1886 '1887'.  Revision des Nostocacées hétérocystées contenues dans les principaux herbiers de France.  Annales des Sciences Naturelles, Botanique, Septième série 5: 51-129.

Graham, L. and L. Wilcox  2000.  Algae. Prentice-Hall

Guiry, M.D. and G.M. Guiry  2013.  AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.  http://www.algaebase.org; searched on 28 February 2013.