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REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 109
to retain the name Trentepohlia which was once adopted by Harvey, and at a later date also by
Pringsheim, since it sufficiently indicates that the species in question should be kept distinct from
Callithamnion, and at the same time does not assume the existence of cystocarps like those described
by Thuret and Bornet in C. corymbifera.
T. VIRGATULA, (Harv.). (Callithamnion virgatulum, Harv., Phyc. Brit., Pl. 313; Ner.
Am. Bor., Part II, p. 243.) Pl. X, Fig. 3.
Fronds minute, tufted, branches erect, straight, alternate or secund; spores sessile
or on short stalks, borne either singly or in twos and threes along the branches.
Var. SECUNDATA. (Callithamnion luxurians, Ner. Am. Bor. — C. secundatum,
Lyngb.)
Branches patent, with attenuated, naked, secund, secondary branches.
On Ceramium, Laminaria stems, and other algæ. The variety especially on Zostera.
Common in Long Island Sound; Gloucester, Mass.; Peak’s Island, Maine.
A common species found in summer on different algæ. On the filamentous species it forms small tufts,
and on Zostera it fringes the margins of the leaves with a fine plush scarcely more than a quarter or
half an inch high. The synonymy of the species is very complicated, it having been confused with the
next by some writers. The variety is common on Zostera, and is usually found in American herbaria
bearing the name of C. luxurians. There is little doubt that it is the C. luxurians of the Nereis Am. Bor.,
but whether it is the species described under that name by Agardh is doubtful.
T. DAVIESII, Harv. (Conferva Daviesii, Engl. Bot., Pl. 2329.—Callithamnion Daviesii,
Phyc. Brit., Pl. 314.)
Fronds minute, tufted, branches scattered, patent, bearing in their axils fasciculated
ramuli, at whose tips are borne the spores.
On Rhodymenia.
Gloucester, Mass.
The limits of the species are not well marked. The extreme form is found in C. efflorescent, Thuret, kept
as a distinct species by most writers, in which the branches are few, long, and given off at wide angles,
and the spores borne in dense corymbs or heads in the axils. This form has been found on Cystoclonium
purpurascens at Gay Head.
Among the genera whose relations to the Florideæ must be considered doubtful are Choreocolax and Pseudoblaste,
described by Reinsch in Contributiones ad Algologiam et Fungologiam. Of the last-named genus a single species, of
the former five species, are attributed to the eastern coast of America. The species of Choreocolax consist merely of
rose-colored filaments, which are parasitic in the fronds of different Florideæ, upon the surface of which they
produce irregularly swollen masses, composed in part of the threads of the Choreocolax and in part of the distorted
tissues of the host-plant. The species of Pseudoblaste consist of aggregations of cells arranged in longitudinal series,
which form hemispherical masses on the surface of different Florideæ. In neither genus is any form of reproduction
known, and, for this reason, the descriptions of Reinsch must be regarded as inadequate, since it by no means
follows that plants consisting of rose-colored filaments belong to the Florideæ. One often finds on our coast Florideæ
whose