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ENCOELIUM L y n g b y a n u m .
Elongated Encoelium.
C l a s s a n d O r d e r CRYPTOGAMIA ALGÆ, Linn N a t . O r d . ALGÆ, Juss.
g e n e r i c c h a r a c t e r .
Frons tubuhsa, membranacea, reticulata. Fructus ; apiculi clavati, massa spo-
racea nigra repleti.
Frond tubular, membranaceous, reticulated. Fructification; club-shaped
processes filled with a dark sporular mass.
S P E C I F IC c h a r a c t e r .
F ncielium Lyngbyanum ; fronde elongata, utrinque attenuata.
F. frond elongated, attenuated at both extremities.
ScYTOsiPHON fistulosum, Ag. Disp. p. 24.
S c y to s ip h o n fistulosus, Lyngb. Hyd. Dan. p. 66.—Carm. MSS.
SCYTOSIPHON Filum, var. Jislulosus, Ag. Sp. Alg. v. 1. p. \6 3 .~ S y st. Alg.
p. 258.
Chordaria Filum, vai.Jistulosa, Ag. Syn. p. 14.
ULVA[fistulosa, Huds. Fl. Angl. p. 569— Woodw. in Linn. Trans, v. 3. p. 52.
Sm. Engl. Bot. t. 64,2.— With. Bot. Arr. v. 4 . p. 153.
C o n f e r v a Fistula, Both. Cat. Bot. v. 3. p. J 69.
U lva lumbricaUs, Lam. ) - , ,
U lva simplicissima, Clem'. / ^
H ab. Sea-shores, fructifying in autumn. Appin, Captain Carmichael.
F rith of Forth.
Boot minute, scutate. Fronds several, growing from the same base, 6 inches
to 18 inches in length, tubular, somewhat inflated, attenuated at both
extremities, in the centre 2 to 4 lines in diameter, occasionally contracted
here and there. Colour olivaceous. Substance between membranaceous
and coriaceous ; somewhat tenacious, and gelatinous to the touch ;
under the microcoscope it appears to be of a reticulated structure. Fruc-
iifcation composed of numerous groups of minute club-shaped apiculi,
containing a blackish sporular mass. To the naked eye, the groups of
apiculi appear like so many dark dots.
It is strange, observes Captain C a r m i c h a e i , , that the fructification
of this very common plant should have escaped detec-
290