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444 109. Parmelia. 4. CENOTHALAME.^. PL cell. apk.
31, Parmelia cycloselis. Circular border-moss.
Thallus round, livid grey; underneath black, fibrilled,
spongy ; jags grown together, tiledlike, rather flat, flnger-
like, many-cut, crenately torn, slightly fringed; edges at
length raised up, crisp rather powdery ; apotliecia scattered,
black, brown ;
border raised, not in the least cut.
Lichen subtilis, Persoon, according (o Achar Syn. Licli. 217.
Lichen dcntatiis, Persoon, according to Acharius 1, c.
Liciien orbicttlarig, Neckar Meth. 88.
Lichen cycloselis, ytchar. Prod. 115 ; Engl. Bot. 1942.
Lobaiia oi hicularis, Huffm. Gimi. 155.
Parmelia cycloselis, ^ckar. Meth. 199 ; Licit. 4S2.
On the trunks of trees.
E. Lecide^. Thallus crustaceous, adnate; apotliecia
shield Hke, bordered.
XX. 110. PSOROMA. Acharias. Psorome.
Thallus crustaceous, flat, expanded, adnate, uniform, indeterminately
figured, scaly or tiledlike; apothecia saucershape,
thick, sessile, adnate; proligerous Jiake forming the
centre, plano-convex, coloured, covering the apothecium
above; inside cellular, streaked; border thickisli, formed
of the thallus and similar in colour, nearly free.
1. Psoroma cervinum. Stags-horn psorome.
Crust in beds, figured, scaly, rather lobed, chestnutcolour;
apothecia immersed, flattish, brownish black; thalloid
border at length prominent.
Lichen Fquamulo?iis, Achar. Prod. 230; Engl. But. 2011.
Lichen cervinn?, Persoon.
Parmelia peli-cypha, Wuhlenb. in Jcha