414 109. Parmelia. 4. CENOTHALAMEiE. Pl.cell.aph. 
31. Parmelia cycloselis. Circular border-moss . 
Thallus round, livid grey; underneath black, fibrilled, 
spongy ; jags grown together, tiledlike, rather flat, finger- 
like, many-cut, crenately torn, slightly fringed; edges at 
length raised up, crisp rather powdery ; apothecia scattered, 
black, brown; border raised, not in the least cut. 
Lichen subtilis, Persoon , according to Achar Syn. Licit. 217. 
Lichen dentatus, *Persoon, according to Acharius 1. c. 
Lichen orbicularis, Neckar Meth. 88. 
Lichen cycloselis, Achar. Prod. 115 ; Engl. Bot. 1942. 
Lobaria orbicularis, Hoffm. Germ. 15&. 
Parmelia cycloselis, Achar. Meth. 199 ; Lich. 482. 
On the trunks of trees. 
E. Lecidea;. Thallus crustaceous, adnate ; apothecia 
shieldlike, bordered. 
XX. 110. PSO ROMA. Acharius. Psorome . 
Thallus crustaceous, flat, expanded, adnate, uniform, in- 
determinately figured, scaly or tiledlike; apothecia saucer- 
shape, thick, sessile, adnate; proligerous flake forming the 
centre, plano-convex, coloured, covering the apothecium 
above; inside cellular, streaked; border thickish, formed 
of the thallus and similar in colour, nearly free. 
1. Psoroma cervinum. Stags- horn psorome. 
Crust in beds, figured, scaly, rather lobed, chestnut- 
colour; apothecia immersed, flattish, brownish black; thal- 
loid border at length prominent. 
Lichen squamulosus, Achar. Prod. 230; Engl. Bot. 2011. 
Lichen cervinus, Persoon. 
Parmelia peliscy pha, (Vaklenb. in Achar. Meth. Sup pi. 41. 
Parmelia squamulosa, Achar. Meth. 181. 
Lecanora halophaea, Achar. Lich. Univ. 408. 
Lecanora badia, Achar. Lich. Univ. 407. 
On walls and rocks, especially limestone. 
2. Psoroma crassum. Thick psorome. 
Crust scalelike, greenish white and brown ; lobes tiled- 
like, deeply crenate, waved, irregular ; apothecia flat, swol- 
len, brownish red, afterwards blackish brown ; thalloid bor- 
der thin, not cut, at last very small. 
Lichen laqueatus, WulfinJacq. Coll. 3. 
Lichen cartilagineus, Lightf. Scot. 815. 
Lichen crassus, Hudson FI. Angl. 659. 
Parmelia crassa, Achar. Meth. Lich. 185. 
Lecanora crassa, Achar. Lich. Univ. 191. 
On the ground on mountains. 
