Pl. cell. aph. 4. CENOTHALAME. 111. Placod. 447 
2. Placodium lentigerum. Lentil placodium. 
Crust slightly tiledlike, white; lobes rather concave, 
bent, deeply crenate; apothecia flattish in the centre, red- 
dish yellow ; tHalloid border raised, tumid, bent in, slightly 
crenate. 
Lichen lentigerus, Web. Goeté. 192; Engl. Bot. S71. 
Psora lentigera, Hoffm. Germ. 164. 
Parmelia lentigera, dchar. Meth. 192. 
Lecanora lentigera, Achar. Lich, 425. 
On the ground and mosses on mountains. 
3. Placodium saxicolum. Rock placodium. 
Crust slightly tiledlike, scaly, wrinkled, unequal, pale 
greenish; circumference rayed, lobed; apothecia very- 
crowded, centre flat, yellowish, pale red, rather ochry ; 
thalloid border becomes bent, crenate. 
Lichen ochroleucus, Wulf. in Jacq. Coll. 2. 
Licher saxicola, Pollich Palat. 225; Engl. Bot. 1695. 
Lichen muralis, Dicks. Crypt. 1, 11. 
Psora muralis, Hoffm. Germ, 157. 
Parmelia saxicola, Achar. Meth. 157. 
Lecanora saxicola, dchar. Lich. 451. 
On stones, walls, and timber-buildings. 
4. Placodium murorum. : Wall placodium. 
Crust plaited, wrinkled, cracked, yelk of egg yellow; 
surface powdery, hoary ; circumference rayed, plaited ; 
jags linear, convex, cut; apothecia crowded, centre growing 
convex. darker; thalloid border not cut, bent. 
Lichen candelarius, Lin. S. P. 1608. 
Lichen murorum, Hoffm. Lich. 63. 
Lobaria saxicola, Hoffm. Germ. 158. 
Parmelia murorum, Achar. Meth, 198. 
Lecanora murorum, Achar. Lich, 455, 
On stones and walls. 
5. Placodinm fulgens. Shining-yellow placodium. 
Crust almost contiguous, pale-yellowish; circumference 
piaited, slightly lobed; lobes bent, flat ; epothecia scattered, 
centre very red, plano-convex; ¢halloid border at length 
bent and crenate, very small. 
Lichen fulgens, Swartz in Nov. Act. Ups. 4, 246, 
Lichen citrinus, Ehrhart. 
Psora citrina, Hoffm. Germ. 165. 
Parmelia fulgens, Achar, Meth. 192. 
Lecanora fulgens, dchar. Lich, 457. 
On the ground on limestone rocks. 
