Wurdemannia setacea Harv.

Collins & Hervey.Algae of Bermuda.Contri
T&A^yruOLAibo'
uuuiuhb uennuaa biological station for
Besearoh, no. 69, page 104, August 1917.
Wurdemannia Harvey. P I oLt
W. setacea Harvey, 1853, p. 246; P. B.-A., No. 1887. A very
common plant in quiet shallow water, all about the islands and
dredged down to 18 m. It is quite variable in size, amount of rami-
THE ALGAE OF BERMUDA.
fication etc. It often forms dense mats, attached to the substratum
by frequent rhizoids; at other times only the bases of the filaments
are attached, the upper part forming loose tufts. Cystocarps and
antheridia are unknown, tetraspores seldom occur, but were found in
plants collected at Smith’s Bay, Nov., Hervey. Short much branched
forms might be mistaken for Gelidium, but on sectioning, the absence
of the fine descending rhizoidal filaments of the internal layer is a
sufficient distinction. Gelidiopsis gracilis Vickers, Algues de la
Barhftde, No. 126, seems to be this species; we have compared her
specimen with an authentic specimen of W. setacca from the Harvey
herbarium, and both with Bermuda material, and can find no differ-
ences.
Alg^e Borkali-American^e
Lefft F. S. Collins.
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