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Name derivation:

After French brothers H.M. and P.L. Crouan, phycologists who studied Caribbean seaweeds (Dawes and Mathieson 2008).


Crouania  J. Agardh 1842;  17 of 33 species descriptions are currently accepted taxonomically (Guiry and Guiry 2016).

Class Florideophyceae;  Order Ceramiales; Family Callithamniaceae


Erect uniseriate bushy thallus up to 5 cm long, attached by rhizoids from basal cells.  Exude a jelly-like matrix that may have calcium carbonate.  Abundant branching; branchlets taper toward tips (Dawes and Mathieson 2008).

Similar genera:

Mesogloia C. Agardh 1824


Subtropical to tropical marine shores, common, entangled with other seaweeds or epiphytic on seagrass (Ibid.)


Dawes, C.J. and A.C. Mathieson 2008. Seaweeds of Florida. University Press of Florida (592 pp).

Guiry, M.D., and G.M. Guiry  2016.  AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.  http://www.algaebase.org; searched on 16 January 2013.