320 
2. THALASSIOPHYTAE. PI. cell aph. 
Thallus confluent, flat, ribbed, forked ; 
vesicles innate or 0 ; apothecia terminal Fucus. 74. 
Thalhis confluent, compressed, ribless; 
vesicles innate ; apothecia pedicelled Halidrys. 75. 
Thalhis leaflike, branched ; 
vesicles innate ; apothecia terminal Mackaia. 76. 
Thallus leaflike, branched ; t 
vesicles pedicelled, globular Baccalaria. 77. 
Thallus confluent; vesicles pedicelled, 
podshape; apothecia lateral Siliquaria. 78. 
Ke. Sporidia scattered in the swollen tips of the branches . 
Thallus threadlike, forked Furcell aria. 79. 
A. Ceramide.32. Thallus threadlike, membranaceous, 
or leatherlike, tubular, jointed ; joints 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-gut . 
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 . Wormlike 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 
being so much branched. 
