468 115. Lecidea. 4. CENOTHALAMEiE. Pl.cell.aph 
Lichen pruinosus, Achur. Prod. 77 ; Engl. Bot. 2244. 
Lichen pruinatus, Dickson Crypt. 3, 15. 
Verrucaria albo coerulescens, Hoffm. Germ. 189. 
Lecidea pruinosa, Achar. Meth. 55. 
Lecidea albo-caerulescens, Achar. Lich. 188. 
On rocks and stones. 
Thalius varies according to the age of the plant, cracked, 
smooth, powdery, or even 0 ; and in colour white, grey or 
rust-colour. 
22. Lecidea ahietina. Fir lecidea . 
Crust spreading, very thin, smooth, greenish grey; apo- 
ihecia nearly sessile, flat, black, grey hoary; edge raised, 
swollen. 
Lichen abietinus, Achar. Prod. 57 ; Engl. Bot. 1682. 
Lecidea abietina, Achar. Lich. 188. 
On the bark of fir-trees, and the dead wood. 
23. Lecidea speirea. Veiled lecidea . 
Crust tartarlike, not broken, very white; apothecia sessile, 
thick, black with a white hoariness, bordered, afterwards 
convex, naked, frequently surrounded with a thalloid base 
inside black with a greyish bed under the centre. 
Verrucaria calcarea ? Hoffm. Germ. 135. 
Lichen rimosus, Dickson Crypt. 1, 12; Engl. Bet. 1736. 
Lichen speireus ? Engl. Bot. 1542. 
Lecidea ainylacea speirea, Wahlenh. Lapp. 476. 
Lecidea speirea, Achar. Meth. 52 ; Lich. 184, exci. var. /3. 
On stones and rocks. 
24. Lecidea margaritacea. Pearly lecidea. 
Crust tartarlike, not broken, whitish green marked with 
black ; apothecia minute, sunk then rising up, sessile, thick, 
with a white hoariness, inside black; border swollen. 
Lecidea margaritacea, Achar. Lich. 135. 
On rocks. 
25. Lecidea epipolia . Wall lecidea. 
Crust tartarlike, spread regularly, cracked in beds, 
white; beds swollen, rough; apothecia sessile, hemispheri- 
cal, greyish hoary; inside black, edge of the base thin, 
persistent. 
Lichen niveo-ater, Dickson Crypt. 4. 
Lichen epipolius, Engl. Bot. 1137. 
Lecidea epipolia, Achar. Meth. 65; Lich. 186. 
On walls and stones. 
