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54
THE MARINE ALGÆ OF NEW ENGLAND.
by the large size of the filaments and remoteness of the branches, together with the shortness of the
ultimate branches. The Cladophora diffusa of the Phycologia Brittanica is now considered, with good
reason, to be a form of C. Hutchinsiæ in which the branches are very long and nearly destitute of
branchlets. Probably the Cladophora diffusa? of the Nereis Am. Bor., said by Harvey to be found in
“New York Sound,” is to be referred to the present species. Specimens which correspond well enough to
the C. diffusa of the Algæ Danmonienses, No. 144, have been collected by Mrs. Davis and Mrs. Bray at
Gloucester.
C. FLEXUOSA, (Griff.) Harv.
“Filaments very slender, pale green, tufted, flexuous, sparingly and distantly
branched; branches elongate, subsimple, of unequal length, flexuous, sometimes
nearly naked, sometimes ramuliferous; the ultimate ramuli secund or alternate,
short or long, curved; articulations of the branches 3-4 times, of the ramuli twice as
long as broad.” (Nereis Am. Bor., Part III. p. 78.)
Rocks between tide-marks, &c.
Hingham and Boston, Mass.; Jackson Ferry and Hell Gate, N. Y.
We have quoted from the Nereis Am. Bor. the description given by Harvey of the present species, and
have purposely refrained from adding any localities of our own. Harvey considers C. flexuosa very
nearly related to Cl. glaucescens, if indeed it is distinct from it. On the other hand, the greater part of
the French specimens of C. flexuosa which we have seen are quite distinct from C. glaucescens, and
seem to approach some of the forms of C. gracilis. We have frequently seen at Wood’s Holl, Newport,
and Gloucester specimens which correspond pretty well with the C. flexuosa of Alg. Danmon, No. 227.
As we understand the species, it is more rigid than Cl. glaucescens, and has shorter branches, which
are at times refracted. The cells are .02-6 mm in diameter and not more than two or three times as long
as broad as a rule. Le Jolis states that C. flexuosa lines the bottom of pools. The American forms which
we would refer to this species are found in pools on rather exposed rocky shores.
C. MORRISIÆ, Harv.
“Tufts elongate, dense, somewhat interwoven, dark green; filaments very slender,
much and irregularly branched; the penultimate branches very long, filiform,
flexuous, simple, set with alternate or secund, short, erecto-patent ramuli, some of
which are simple and spine-like, others pectinated on their upper side; articulations
filled with dense endochrome, in the branches 2-3 times, in the ramuli about twice
as long as broad, cylindrical, not contracted at the nodes.” (Harvey, Nereis Am. Bor.,
Part III, p. 79, Pl. 45 b.)
Elsinborough, Del., Miss Morris.
We only know this species from the description and plate of Harvey.
C. Rudolphiana, Ag.
Filaments very long and gelatinous, forming loose tufts one or two feet long, color
yellowish green; branches opposite or irregular, very long and flexuous, given off at
wide angles, clothed with long, secund,