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REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 43
β. Var. LACTUCA, Le Jolis. (U. latissima, Harv., partim.—Phycoseris gigantea, Kütz.)
Frond orbicular, oblong or elongate-fasciate, simple, undivided or scarcely Lobed,
frequently spirally contorted.
γ. Var. LATISSIMA, Le Jolis.
Frond simple, at first cuneate-substipitate, afterwards broadly expanded.
Very common all over the world, especially in brackish waters.
The present species nearly corresponds to the Ulva latissima of the Nereis Am. Bor., but is not the U.
Lactuca of that work. It is distinguished from the remaining species by being always flat, never tubular
at any age, and by its more or less orbicular outline not becoming linear or ribbon-shaped. Var. α is the
common Ulva on rocks and in pools exposed to the action of the waves. The frond, although not very
large, is rigid, and does not adhere well to paper in drying. In outline it is orbicular, and is generally
deeply incised. Var. β has a more elongated shape, and is generally plicato-undulate. Var. γ is very
common in brackish places on the mud, and attains a very Large size. When fully grown it has no
definite shape, but is ragged on the margin and often perforated.
Ulva enteromorpha, Le Jolis.
Frond linear or lanceolate in outline, attenuated at base, the two layers of cells
either entirely separating, so as to form a tubular frond, or slightly cohering,
forming a flat frond.
α. Var. LANCEOLATA, Le Jolis. (Ulva Linza, Greville & Harvey.—Phycoseris
lanceolata and crispata, Kützing.)
Frond narrow, flat, ribbon-shaped, unbranched, much attenuated at base, margin
somewhat crisped, sometimes so much so that the frond appears spirally twisted.
β. Var. INTESTINALIS, Le Jolis. (Enteromorpha intestinalis, Auct.)
Frond simple, attenuated, and subcompressed at base, above tubuloso-inflated.
γ. Var. COMPRESSA, Le Jolis. (Ulva compressa, L.— Enteromorpha compressa, Auct.)
Frond tubuloso-compressed, generally proliferously branched, branches uniform,
simple, attenuate at the base, broader and obtuse at the apex, color somewhat dingy.
Very common all over the world, particularly in brackish water.
This species includes the Ulva Linza, Enteromorpha intestinalis, and Enteromorpha comressa of the
Nereis Am. Bor., which can only be regarded as varieties of one species. The species reaches its highest
development in the var. β (Enteromorpha intestinalis, Auct.), which is excessively common in all
shallow water along our coast, and is conspicuously disagreeable by its resemblance in shape to the
swollen intestines of some animal. The species approaches Ulva Lactuca, L., in var. α, which is not so
common as the other forms of the species whose long ribbon-like fronds are compressed instead of
tubular, as in var. β. In var. γ, with branching instead of simple fronds, the