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320 2. THALASSIOPHYT^. VI. cell. aph.
Thalkis confluent, flat, ribbed, forked
vesicles innate or 0; apoihecia terminal Fucus. 74-.
Thallus confluent, compressed, ribless;
vesicles innate ; apoUiecia pedicelled Hah,drys. 75.
Thallus ieaflike, branched
vesicles innate ; apoihecia terminal ....... Mackaia. 76.
Thallus leaflike, branched ;
vesicles pedicelled, globular Baccalakia. 77.
Thallus confluent; vesicles pedicelled,
podshape; apothecia lateral Siliouaria. 78.
Ke. Sporidia scattered in the swollen tips of the branches.
Thallus threadlike, forked Furcellaria. 79.
A. Ceramide^. Thallus threadlike, membranaceous,
or leatherlike, tubular, ]om\.ed. ijoijits all formed of a single
tube; knots generally pellucid ; sporidia enclosed in a naked,
or involucrated capsular theca.— Generally rose-red, rarely
brown or green, mostly marine.
I. 26. MESOGLOJA. Agardh. , Slime-gui.
Thallus threadlike, jointed, forked ; branches springing
horizontally from an imaginary central axis; the whole
forming a branched, threadlike, olive, gelatinous mass
inner part very compact, outer looser ; thecce ovate at the
end of the threads, surrounded by the swollen beadlike
branches.—Marine.
Mesogloja vermiculata. JVorinlike slime-gut.
Mass much branched, cylindrical ; branches scattered,
crooked, attenuated, mostly divided ; thallus. branched :
branches alternate; joints rather longer than broad; knots
contracted.
Rivularia vermiculata, Engl. Bot. 1818.
Sea-shores; July and August.
Mass 4 to 9 inches long, olive-brown, very unequally
branched. It differs from the M. vermicularis of Agardh,
Syn. 126, and Lyngbye Hydr. Dan. 165, by the lower joints
being 3 or four times as long as broad, and the mass not
beina: so much branched.