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90
THE MARINE ALGÆ OF NEW ENGLAND.
as has been suggested by Janczewski in speaking of Sporochnus, the frond of Stilophora grows in a
manner similar to that of Cutleria, which may be said to belong to the compound trichothallic type.
S. RHIZODES, Ag. (Sporochnus rhizodes, Ag., Spec.—Spermatochnus rhizodes, Kütz.,
Spec.—Stilophora rhizodes, J. Agardh; Phyc. Brit., Pl. 70; Ann. Sci. Nat., Ser. 3, Vol.
XIV, Pl. 28.) (Pl. V, Fig. 4, Pl. VI, Fig. 2.)
Fronds attached by a disk, filiform, solid, becoming somewhat fistulous, six inches to
two feet long, branching subdichotomously, destitute of distinct axis, branches
becoming attenuated, ultimate divisions erect; sori very numerous, scattered
irregularly over the frond; paraphyses few-celled, clavate, somewhat incurved;
unilocular sporangia oval; plurilocular cylindrical.
Not uncommon at various points in Vineyard Sound and Long Island Sound on algæ
and eel-grass below low-water mark.
The present species is sometimes found at the base of eel-grass and the larger algæ, but it is more
commonly found in entangled masses a foot or two long washed ashore in sheltered bays after a heavy
blow. The determination is not altogether satisfactory, for our plants are generally coarser than the
European forms of the species. Nor do they correspond to S. Lyngbyei, which is coarser and more
tubular, and has finer ultimate branches and sori which are somewhat remote and arranged in
transverse bands, if we follow Harvey’s description. Another species, hardly coming within our limits,
was found by Bailey in the Chesapeake and referred by Harvey, with considerable doubt, to S.
papillosa, Ag.
STRIARIA, Grev.
(From stria, a ridge, referring to the arrangement of the sporangia in transverse lines.)
Fronds attached by a disk, tubular, branched, cells of the interior large, roundish, of
the exterior smaller and subrectangular; fruit conconsisting [sic] of sporangia (or
spores?), arranged in transverse lines.
A genus whose position is very doubtful, because the structure of the fruit is not sufficiently well
known. By most writers it is placed in the Dictyotaceæ, but it is not certain that the typical species, S.
attenuata, possesses the peculiar antheridia and tetraspores of that order. According to Areschoug,
there are two forms of fruit, one immersed, as in Punctaria, the other external, as in Asperococcus.
S. ATTENUATA, Grev., Phyc. Brit., Pl. 25; Ner. Am. Bor.‚ Vol. Ill, Suppl., p. 123.
Fronds a few inches to a foot long; branches usually opposite, attenuated to a fine
point.
Flushing, L. I., Bailey.
The only American specimen known is that mentioned by Harvey in the Supplement to the Nereis Am.
Bor. as having been found at Flushing, L. I.
FAMILY LAMINARIEÆ.
Fronds large and coarse; species on our coast usually attached by root-like processes,
and with a stipe and expanded lamina, in one genus