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m.celLapk. 4. CENOTHALAMEiE. ll2.Rinod. 4^4*^
a. ylpothecia naked, black.
1 Rinodina alra. Black rinodine.
Crust indeterminately formed, cracked, granular, warty,
greyish white; apothecia flat in the centre, afterwards
slightly swollen, black ; thalloid hoi'der raised, free, at length
bent and crenulated.
Lichenoides crustaceiini et leprosum, scutellis nigricantibus tnajoribus
€t minoribus, Dillen Muse. 133.
Lichen tephromelas, Ehrh. Crypt.
Engl. Dot. 949.
Lichen ater, Hudson Fl. Angl. 530 ;
Parmelia atra, Achar. Meth. 154,
Lecauora atra, Achar. Lich. 344.
On stones, rocks, and the bark of trees.
Thallus sometimes whiter, sometimes greyer; apothecia
either very crowded, flat and then convex with the border
not cut ; or varying in size, with the border crenate and
bent.
2. Rinodina ocnlata. Eyed rinodine.
Crust bald, nippled, branchbearing, black; apothecia
sessile, scattered, some slightly podicelled; centre rather
concave, black, their proper edge at length bent; thalloid
harder swollen.
Lichen dactylinus, IVahl. Lapp. 414.
Lichen oculatus, Dicks. Crypt. Brit. 2, 17.
Isidium oculatuin, Achar. Meth. 140 ; Lich. 576.
Forming a crust on alpine mosses.
3. Rinodina coarctala. Contracted rinodine.
Crust difliise, thin, cracked, slightly wrinkled, unequal,
greyish; apothecia black, centre sunk, then raised, flat;
thalloid border raised, bent in, irregular, contracted, pow-
dery.
Lichen coarctatus, Engl. Bot. 534.
Parmelia coarclata, Achar. Meth, Lich. 158.
Parmelia elacista, Achar. Meth. Lich. 159.
Lecanora coarctata, Achar. Lich. Univ. 352.
On stones and brick walls,
4. Rinodina periclea. Shielded rinodine.
Crust thin, nearly leprous and dispersed, whitish ; apo^
Ihecia plano-convex in the centre, black, transparent, rough;
thalloid border at the base, very small, powdery, becoming
imperceptible.
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