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486 5. IDIOTHALAME^. P/. cell aph.
Fam.V. 5. IDIOTHALAME^. Mganim pars, Um^.
Lichenum pars, Jussieu, Acharius.
Thallus crustlike or leatherlike; sporidia scattered, innate
in the substance, and in a nucleus or proligerous flake
covered by the thallus, or by a single or double perithecmm.~ThaUus
perennial, terrestrial, or parasitical; greenish
or becoming so when wetted ; absorbing water by the sur-
face, and transmitting it to all parts.
'A. Thallus Icalherlike, shrublike; apothecia tubercular
perithecium 0. Rhizomorphidae.
Thallus crustlike, cartilaginous,
branched, shrublike, upriglit SpHiERoPHORON. 122»
Thallus crustlike, membranaceous,
branched, creeping, prostrate Rhizomorpha. 123.
B. Thallus crusil'ike ; apothecia jvart like ; perithecium
distinct. Variolaridee.
Thallus crustlike Variolaria. 124.
C. Thallus crust like ; apothecia wartlike; perithecium
distinct. Porinida.
Nucleus single
perithecium simple, black Pyrenula. 125*
Nucleus simple; perithecium double,
first thick, second membranaceous. . . Thelotrema. 126.
Nucleus mostly single, covered ;
perithecium simple Porina. 127.
D. Thallus crustlike; apothecia round, not bordered;
perithecium distinct. Vcrrucaridse.
Thallus cartilaginous, membranaceous,
perithecium double Lejophlea. 128.
Thallus crustlike, cracked in beds,
or powdery; perithecium double Lithocia. 129.
Thallus soft, towlike, spongy or
cobwebby; perithecium Aovihlc Inoderma. 130.
Thallus leaflike or shieldlike;
perithecium single Endocarpon. 131.