Polysiphonia cokeri Hollenb.

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POLYSIPHONIA Sp.

Repent, forming thin diffuse mats about 1.5 cm. (or more?)
in diameter; pericentral siphons 4, ecorticate; main filaments
rather sparingly radicelliferous, 65-105 \x in diameter, their seg-
ments 1 x/i-2 times as long as broad; branching alternate, often
appearing subdistichous -and loosely virgate-fasciculate toward
the apices, the branches usually separated by six segments; ulti-
mate ramuli erecto-patent or subappressed, fusiform, tapering
about equally to base and apex, mostly 0.17-0.50 mm. long and
3°~35 M in maximum width, their segments shorter than broad
or subequal toward base, fibrils (“hairs,” “leaves”) short and
inconspicuous.

On Sargassum, Lobos de Afuera, .December 5, 1907, Coker 27Q
p.p.\ also in the same locality, March 18, 1907, Coker 126 p.p.,
associated with Caulerpa flagelliformis ligulata and Polysiphonia
paniculata. This small repent 4-siphoned plant is evidently
allied to Polysiphonia sertularioides (Grat.) J. Ag. and P. subtilis-
sima Mont., but is apparently not referable to either. It seems
to differ from both in having the ultimate ramuli obviously nar-
rowed at tlie base, from P. subtilissima also in the smaller tufts,
and from P. sertularioides in the much less conspicuous hairs.
It is possible that the plant represents an undescribed species but
our material is scanty and sterile, and, with Polysiphonia Gelidii
Zanard. and certain other oligosiphonous repent species known to
us from brief description only, we would hardly venture at this
time to propose for it a new specific name.

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