PL cell. a pit. 5. IDIOTHALAMEiE. 1 34-. Hysterina. 505 
Opegrapha rupestris, Persoon in Uster Ann. 11,20. 
Opegrapha Persoonii, Achar. Meth. 17 ; Lich. 246; Engl. Bot. 2345. 
On rocks and walls. 
/3. aporea. Crust tartarlike, leprous, uneven, powdery; 
apoihecia roundish, irregular, wavy, plaited, serpentine, in 
various manners, gaping. 
Lichenis simplieis varietas, Dailies Tr. Lin. Soc. 2, 284. 
Lecidea privigna, Achar. Mdh. 49. 
Opegrapha Persoonii aporea, Achar. Meth. 17 ; Lich. 246. 
y. strepsodina. Crust very thin, scarcely any, smooth, 
greyish ; opothecia crowded, roundish, irregular, wrinkled 
and bordered. 
Opegrapha Persoonii strepsodina, Achar. Lich. 247. 
On slate-rocks. 
3. Hysterina petr&a. Rock slit-moss. 
Crust tartarlike, cracked in beds, dirty-white ; beds 
smooth ; apothecia sessile, oblong, nearly linear, swollen, 
straightish, rather shining; centre slitlike, between raised 
edges. 
Opegrapha petrasa, Achar. Syn. 72. 
On rocks. 
4. Hysterina calcar ea. Limestone slit-moss. 
Crust tartarlike, powdery, very white; apothecia rather 
long, straight, swollen, opake, aggregated in stars ; centre 
slitlike. 
Opegrapha calcarea, Engl. Bot. 1790; Achar. Lich. 250. 
On the mortar of old walls, and on limestone. 
5. Hysterina macularis . Spotted slit-moss. 
Crust regular, uneven, brown-black ; apothecia small, 
run together, roundish, elliptic, growing wrinkled, irregu- 
lar ; centre slitlike. 
Lichenoides punctatum et rugosum nigrum, Dillen Muse. 125. 
Lichen rugosus, Lin. S. P. 1607. 
Lichen macularis, Relhan Cant. 446. 
Opegrapha quercina, Persoon in Uster Ann. 7,31. 
Opegrapha conglomerata, Persoon in Uster Ann. 7, 31 ; Achar. Meth. 
23. 
Opegrapha faginea, Persoon in Uster Ann. 7,31. 
Opegrapha macularis, Achar. Lich. 247 ; Meth. 21. 
Opegrapha epiphega, Achar. Meth. 24. 
Opegrapha macularis conglomerata, Achar. Lich . 247. 
Opegrapha macularis fagiuea, Achar. Lich. 248. 
On the bark of the branches of beech and oak trees. 
