486 5. IDIOTHALAMEZ. Pl. cell. aph. 
Fam. V. 5. IDIOTHALAME. Algarum pars, Linn. 
Lichenum pars, Jussieu, Acharius. 
Thallus crustlike or leatherlike; sporidia scattered, in- 
nate in the substance, and in a nucleus or proligerous flake 
covered by the thallus, or by a single or double perithe- 
cium.--Thallus perennial, terrestrial, or parasitical ; greenish 
or becoming so when wetted; absorbing water by the sur- 
face, and transmitting it to all parts. 
A. Thallus leatherlike, shrublike; apothecta tubercular ; 
perithecitum 0. Rhizomorphide. 
Thatlus crustlike, cartilaginous, 
branched, shrublike, upright ..... SPHEROPHORON. 122. 
avai crustlike, membranaceous, 
branched, creeping, prostrate...... RuizomorpHa. 123. 
B. Thallus crustlike ; apothecia wartlike ; perithecium 
distinct. Variolaride. 
Phallus crusthike cy oh. 2% 36%s side OL ARIOUARTAC DLO 4:. 
C. Thallus crustlike ; apothecia wartlike ; perithecium 
distinct. Porinidee. 
Nucleus single ; 
perithectum simple, black ............ PYRENULA. 125. 
Nucleus simple; perithectum double, 
first thick, second membranaceous... THELOTREMA. 126. 
Nucleus mostly single, covered ; 
Perit hecizime: Simple ges af. feys trancich ol ejrysORUNAA Yel 2 7 
D. Thallus crustlike ; apothecia round, not bordered ; 
perithecium distinct. Verrucaride. 
Thallus cartilaginous, SRM MC 
perithecium dotble’ 04 chaae ... LEJOPHLEA. 128. 
Thallus crustlike, cracked in beds, 
or powdery; perithecitum double........ LitHocta. 129. 
Thallus soft, towlike, spongy or 
cobwebby ; perithecium double ........ INopERMA. 130. 
Thallus leaflike or shieldlike; 
perithecium single ..........++.... ENDOCARPON. 131. 
