Hydrocoleum codicola Setch. & N.L.Gardner

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Herbarium of the University op C^al^OTANICAL

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Hydrocoleum codicola Setchell & Gardner, sp. nov.
Proc.Calif.Acad.Sci.IV.12:701. pi.12.f.3. 13 % 1924.

Filaments associated more or less into loose
rope-like colonies Interwoven among the utricles
of the host; sheath very delicate and hyaline,
containing few to many trichomes; triehomes cylin-
drical or at times slightly tapering at the apices,
pale blue-green,2.75-3.25 p. diam.; cells not con-
stricted at the dissepiments, 0.5-1.5 times as long
as the diameter, the terminal cells somewhat enlarg-
ed and rounded with decidedly thickened end walls.

Penetrating among the utricles of Codium sp.,
in the upper sublittoral belt.

Type s No. 1319» Herb. Calif. Acad. Sci. ,
collected by Ivan M. Johnston (No. 8a), in June,
at San Marcos Island, Gulf of California.

The habitat of this species of Hydrocoleum
is decidedly unusual and the trichomes are the
narrowest yet described for the genus. The genus
typically has few and relatively large trichomes.

It is difficult to distinguish the largest colonies
from certain species of Phormidium but the smaller
colonies are definitely bound together In a single
sheath. The trichomes, however, are not densely
intertwined like those of Microcoleus. It seems
generally prevalent on various species of smaller
Codiums in the Gulf.

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