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102
THE MARINE ALGÆ OF NEW ENGLAND.
elongated; receptacles swollen, broad, usually united in pairs, and sometimes with a
small margin formed of the unchanged frond.
Exs.—Algæ Am. Bor., Farlow, Anderson & Eaton, No. 107.
Eastport, Maine; coast of Massachusetts; Northern Europe; Arctic Ocean.
A species apparently common north of Cape Cod, and at Eastport quite as common as F. vesiculosus, for
which it might be mistaken. As found with us, it is broader than the last-named species and is usually
without bladders, and when these occur they seem more like irregularly inflated portions of the frond
than spherical cavities. The receptacles contain both antheridia and oospores, the latter occupying the
base and the former the upper part of the conceptacle. The receptacles are broader and less swollen
than in F. vesiculosus and are often in pairs, the pairs being united below. The whole plant is shorter,
stouter, and more foliaceous than F. vesiculosus. The species as found in the Arctic regions is variable,
and several forms have been described. The form which occurs at Eastport comes very near the typical
form. F. miclonensis of De la Pylaie is probably a small form of the present.
F. FURCATUS, Ag., Icon. Ined., Pl. 14.
Fronds hermaphrodite, branching very regularly dichotomous, stipitate, one to three
feet long, midrib distinct below, scarcely visible above, margin narrow, rigid, entire;
bladders wanting; receptacles flat, narrow, linear-fusiform, sometimes forking.
Exs.—Algæ Am. Bor., Farlow, Anderson & Eaton, No. 108.
Peak’s Island, Maine; coast of Massachusetts north of Boston; Northern Europe;
Arctic Ocean; North Pacific.
A common and beautiful species on exposed coasts north of Boston. It is found lower down than F.
vesiculosus, at the limit of low-water mark. The frond is narrow, tough, and destitute of bladders, and
the branching very regular, almost flabellate. It is easily distinguished by the receptacles, which are
not in the least swollen and are narrow and longer than in any other species, being sometimes four
inches long. The color is dark.. Our form corresponds perfectly to specimens from Spitzbergen. The
species is less variable than most of the genus and is found at all seasons of the year.
F. FILIFORMIS, Gmelin. (F. distichus, L., in Farlow’s List of the Marine Algæ of the
United States.)
Fronds hermaphrodite, three to six inches long, flabellately dichotomous, stipitate
below, midrib present but indistinct; air-bladders wanting; receptacles linear-oblong,
swollen, borne in pairs, sometimes forking.
In pools near high-water mark.
Nahant, Marblehead, Mass.
Our smallest species, found only in spring and in pools where the water is not very pure. Our form is
the same as No. 201 of Areschoug’s Algæ Scandinavicæ, from Finmark, which Agardh refers to F.
filiformis. Whether F. distichus, L., is not the same as F. filiformis, Gmelin, admits of doubt. The
present form seems to be the F. filiformis of the Flore de Terre-Neuve, mentioned under F. distichus in
the Nereis Am. Bor.