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Plcell.aph. 2. THALASSIOPHYT^. 319
I. Thallus contimied, fibrous, memlranaceous or leather-
like, purple or red; sporidia immersed or in ihecce. Floridese.
Thallus flat, membranaceous, veined;
sporidia immersed and in tubercles .... Delesseria. 59.
Thallus flat, membranaceous, veined
thecce podshaped, axillary Odonthalia. 60.
Thallus flat, membranaceous, ribless
iheccB tubercular Sph^rococcus. 61.
Thallus linear, compressed or round,
much branched ; thecce tubercular Gigartina. 62.
Thallus linear, round or compressed;
sporidia immersed and in thecss Gastridium. 63.
K, Thallus cnntiraiQus, woody, Jibrous, coriaceous; olivehrowii
becoming black ; sporidia in thecce or immersed. Fu-
coidea.
Ka. Sporidia superjicial among gelatinousfibres.
Thallus membranaceous, flat;
fruit scattered ; holdfasts peltate Fascia. 64.
Thallus leatherlike, flat;
fruit scattered; holdfasts fibrous Laminaria. 65.
Thallus leatherlike, flat;
fruit on the stirps; holdfasts fibrous .... Phasgonon. 66.
Thallus threadlike, tubular, supple
sporidia scattered on the surface Chorda. 67.
Thallus threadlike, solid, branched
sporidia scattered on the whole surface . . Chordaria. 68.
Kb. Sporidia in scattered, immersed thecce.
Thallus threadlike, cartilaginous .... Sporochnus. 69.
Thallus compressed, membranaceous Desmarestxa. 70.
Kc. Sporidia in a terminal theca.
Thallus shrubby, compressed Lychina. 71.
Kd. Sporidia in ihecce, immersed on an apothecium.
TA«Z/;^>y cupshaped ; vesicles 0',
apothecia compressed, forked Himanthalia. 72.
Thallus round, forked, ribless;
vesicles 0; apothecia terminal Cervina. 73.