PL cell. aph. 4«. CENOTHALAME/E. 11]. Placed. 447 
2. Placodium lentigerum. Lentil placodium. 
Crust slightly tiledlike, white;- lobes rather concave, 
bent, deeply crenate ; apothecia fiattish in the centre, red- 
dish yellow; tkalloid border raised, tumid, bent in, slightly 
crenate. 
Lichen lenligerus, Web. Goett. 192; Engl . Bot. S71. 
Psora lentigera, Iloffm. Germ. 164. 
Parmelia lentigera, A char. Meth. 192. 
Lecanora lentigera, Achar. Lich. 425. 
On the ground and mosses on mountains. 
3. Placodium saxicolurn. 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 Jaeq. Coll. 2. 
Lichen saxicola, Pollich Palat. 225 ; Engl. Bot. 1695. 
Lichen muralis, Dicks. Crypt. 1,11. 
Psora muralis, Iloffm. Germ. 157. 
Parmelia saxicola, Achar. Meth. 157. 
Lecanora saxicola, Achar. Lich. 451. 
On stones, walls, and timber-buildings. 
4. Placodium murorum. Wall placodium . 
Crust plaited, wrinkled, cracked, } T elk of egg yellow; 
surface powdery, lioayy ; 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, Iloffm. Lich. 63. 
Lobaria saxicola, Iloffm. Genn. 158. 
Parmelia murorum, Achar. Meth. 198. 
Lecanora murorum, Achar. Lich. 455. 
On stones and walls. 
5. Placodium fulgevs. Shining-yellow placodium. 
Crust almost contiguous, pale-yellowish ; circumference 
plaited, slightly lobed ; lobes bent, flat ; apothecia scattered, 
centre very red, plano-convex; thalloid border at length 
bent and crenate, very small. 
Lichen fulgens, Swartz in Nov. Act. Ups. 4, 246, 
Lichen citrinus, Ehrhart. 
Psora citrina, Iloffm. Germ. 165. 
Parmelia fulgens, Achar. Meth. 192. 
Lecanora fulgens, Achar. Lich, 457. 
On the ground on limestone rocks. 
