Hypnea spinella (C.Agardh) Kütz.

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Collins & Hervey.Algae of Bermuda. Contri-
butions Bermuda Biological Station for
Research, no. 69, page 112, August 1917.
3. H. spinella (Ag.) J. G. Agardh, 1847, p. 14; Sphaerococcus p
spinellus Agardh, 1822, p. 323. Cave by Gravelly Bay, Apr., Hervey. I
Forming a dense, inextricable mat on rocks, usually 1-2 cm. thick.
There is probably no genus of red algae of this region the species of
which are so poorly defined, and the plants so little characteristic, as
m
THE ALfŚ?E OF BERMUDA.
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Hypnca. Well developed plants of II. musciformis are easily recog-
nized, but practically everything else is vague and doubtful, and our
determinations of other species are oply tentative. In regard to the
smaller forms, it seems as if no two authors used the same name for
the same plant, and even the best authors are often inconsistent with
themselves. For instance, J. G. Agardh, 1876, p. 564, under II. cem-
comis, refers to II. spinella Kiitzing, 1868, PI. XXVI, as a synonym;
under H. spinella (Ag.) J. Ag., on the next page, he refers to the same
plate. We have collections of Hypnca from several stations to which
we do not feel willing to give specific names. H. comuta reported by
Moseley proves to be Chondria polyrhiza Collins & Hervey.
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