PDF file (text) - Cryptogamic Botany Company

REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 89
and A. bullosus are to be expected to occur with us. The A. compressus of the List of the Marine Algæ of
the United States, in the Proc. Am. Acad. Arts and Sciences of March, 1875, is an error. The only
specimen seen was collected at Gloucester by Mrs. Lusk, and proves to be a bleached and brownish
fragment of Halosaccion.
A. ECHINATUS, Grev.; Phyc. Brit., Pl. 194. (Pl. V, Fig. 3.)
Fronds gregarious, simple, attached by a small disk from two inches to a foot and a
half long, about half an inch in diameter, tapering at base, often twisted but not
constricted, color a dingy brown, spotted with the very numerous sori.
Attached to algæ between tide-marks.
Common along the whole coast; Europe.
A homely species, usually found in tufts four or five inches long, and of about the substance of
Scytosiphon lomentarius but usually spotted with the numerous fruit-dots. The diameter, which is
nearly uniform throughout, is about that of a clay pipe-stem, A. bullosus is much larger and more sacklike
and often decidedly constricted.
FAMILY SPOROCHNEÆ.
Fronds cylindrical or tubular, branching, composed within of elongated cuboidal
cells, which become smaller and roundish at the surface; fructification in external
scattered sori, composed of club-shaped filamentous paraphyses and sporangia;
unilocular sporangia spheroidal; plurilocular sporangia cylindrical formed of a single
row of cells.
Fronds solid, sori irregularly scattered ............................. Stilophora.
Fronds hollow, sori arranged in transverse lines..................Striaria?
STILOPHORA, Ag.
(From στιλη [stile], a point, and φορεω [phoreo], to bear.)
Fronds olive-brown, filiform, branching, solid, becoming hollow, composed internally
of elongated colorless cells, which become smaller and colored towards the surface;
fruit external, scattered in spots (sori) over the surface; sori hemispherical,
consisting of club-shaped filamentous paraphyses, at whose base are borne the
sporangia; unilocular sporangia ovoidal; plurilocular sporangia cylindrical, formed of
a single row of cells.
A genus placed by Agardh and Harvey in the Dictyotaceæ, but by other algologists considered more
nearly related to the Sporochneæ. It includes only a small number of species, probably not more than
eight, and is readily recognized by the external fruit in which the sporangia are borne at the base of
clavate few-celled paraphyses. The development of the frond has not been made out, but at the tips of
the branches is a complicated mass of filaments ending in hairs like those of Ectocarpus, at whose base
are borne a few short, incurved, moniliform filaments. At a short distance below the apex of the frond
the moniliform filaments disappear and the surface appears to consist of roundish cells where not
interrupted by the numerous sori. It is probable that,