Pl.cell.oph. 4. CENOTHALAME^E. 115. Lecidea. 469 
26'. Lecidea corticola. Bark leeidea . 
Owif rather tartarlike, granularly bedded, rough, very 
white; apothecia small, slightly sunk, grey hoary, growing 
globular, not bordered, naked, black; inside greyish. 
Lichen corticola, Achar. Prod. 57 ; Engl. Bot. 1892. 
Lichen albo-ater, Ehrh. Crypt. 176. 
Lichen aroylaceus, Ehrh. Crypt. 3 03. 
Yerrucaria albo-atra, Hoffm Germ. 193. 
Lecidea corticola, Achar. Meth. 53 ; Licit. IS6. 
On the bark and trunks of trees. 
d. apothecia brown-black , brownish , or inclining to brown. ~ 
27. Lecidea Lightfmtii. Light foods lecidea . 
Crust rather spreading, granulated, greenish grey; cipo- 
thecici pressed close, flat, brown black, inside dirty white; 
edges thin, winding, paler than the center. 
Lichen Lightfootii, Engl Bot. 1451. 
Lecidea Lightfootii, Achar. Licit. 177. 
On the bark of birch trees. 
28. Lecidea fiscal a. Embrowned lecidea , 
Crust leprous, rather powdery, blackish brown ; apothecia 
bordered, dark red, when old blackish. 
Lichen fuscatus, Lamarck Encycl. 
Lecidea obscura, Achar. Meth. 75. 
Lecidea fuscata, Achar. Licit. 211. 
On stones. 
29. Lecidea quernea. Oak lecidea » 
Crust leprous, granular powdery, pale yellowish brown; 
apothecia rather sunk, afterwards convex, not bordered, 
brown and black. 
Lichen querneus, Dickson Crypt. 1,9; Engl . Bot. 485. 
Lecidea quernea, Achar. Meth. 62 ; Licit. 202. 
On the clefts of the bark of old oaks, and on other lichens* 
80. Lecidea viriclescens. Greenish lecidea * 
Crust thin, granulated floury, coppery green ; apothecia 
convex, wrinkled, irregular, confluent, brown-black. 
Lichen viridescens, Schrad. Germ. 1 , 88 ; Engl. Bot. 2217. 
Lecidea viridescens, Achar. Meth. 62; Licit. 200. 
Lecidea hypnophyla, Winch 2, 37. 
On ruins, and decayed mosses. 
