2755
ULVA Linza.
Lanceolate Ulva.
CRYPTOGAMIA Algce.
Gen. Char. Frond membranaceous, green, plané,
sometimes saccate and inflated in the young
state. Fructification minute granules mostly
arranged in fours.
Spec. Char. Frond linear-lanceolate, attenuate at
each end, extremely waved at the margin and
consisting of a double membrane.
Syn. Ulva Linza. Huds. FI. Angl. 568. Linn. Sp. PL
1633. Agardh, Sp. Alg. v. 1. 412. Light/. FI.
Scot. 973. FI. Dan. t. 889. Grev. Brit. Alg.
173.
Solenia Linza. Agardh, Syst. Alg. 185.
Tremella marina fasciata. Dill. t. 9. f . 6. &ff. 5.
Tremella marina Porrifolio (Ulva lanceolata,
Linn.).
_A_TTACHED to stones in salt water. Frond linear-
lanceolate, membranous, of a full green, fading in age, six
to eighteen inches or more in length, the base very fine and
threadlike, often giving off a single branch ; the frond soon
expands till it is from two to even five inches broad, and
then again becomes attenuated, the margin beautifully
waved and curled. Below, the frond is tubular; but the
sides of the tube soon collapse, and form a flat frond consisting
evidently of two closely connected membranes.
Sometimes air-bubbles are formed within the plant, and
effect a partial disunion of the membranes. The whole