506 134. Hysterina. 5. IDIOTHALAME^. PLcelLaph. 
6. Hysterina herpetica. Eruption slit-moss. 
Crust nearly membranaceous, very finely cracked and 
wrinkled, rather rough, grey-brown ; opolhecia very small, 
innate ih the crust, crowded, convex, elliptically oblong, 
rather long, straight ; centre slitlike. 
Opegrapha herpetica, Achar. Meth. 25 ; Lich. 248. 
Opegrapha rubella decolorata, Achar. Meth. 21 ; Lich. 248. 
Opegrapha fuliginosa, Persoon in Act. JVetteraw , 2,44. 
Opegrapha rimalis fuscata, Achar. Lich. 261, 
On the trunks of trees. 
7. Hysterina dispar a ta. Unlike slit-moss. 
Crust membranaceous, rather smooth, pale olive, or 
brownish with a green or red cast; apothecia various, round- 
ish, oblong, longish, straight or crooked ; centre slitlike. 
Opegrapha rubella, Persoon in Uster Ann . 7, 31. 
Opegrapha aenea, Persoon in Uster Ann. 7,31. 
Opegrapha viridis, Persoon in Uster Ann. 7,31. 
Opegrapha rubella a and 8, Achar. Meth. 21 , 22. 
Opegrapha siderella aenea, Achar. Meth. 26. 
Opegrapha rubella «, y and 8, Achar. Lich. 249, 250. 
On the bark of trees. 
8. Hysterina vulgata. Common slit-moss . 
Crust cartilaginous, membranaceous, broken, rather 
scaly, smoothish, greenish-white; apothecia sessile, variously 
formed, long, cylindrical, wavy, rather shining ; centre 
slitlike. 
Opegrapha vulgata, Achar. Meth. 20 ; Lich. 250; Engl. Bot. 255, 1811. 
On the clefts of old trees, especially fir-trees. 
9. Hysterina epipasta. Sprinkled slit-moss . 
Crust very thin, rather irregular, smooth, grey ; apothecia 
innate, slightly raised, very small, convex, wrinkled, opake, 
various; the smaller apothecia dotlike; the longer ex- 
tremely narrow, crooked, sometimes branched ; centre and 
edges very slender, scarcely any. 
Opegrapha dispersa, Schrad. Krypt. 167. 
Opegrapha epipasta, Achar. Meth. 26; Lich. 258 ; Engl. Bot. 1828. 
On smooth bark of trees, particularly maple and horse 
chestnut-trees. 
10. Hysterina microscopica. Microscopic slit-moss. 
Crust very thin, rather shining, pale olive; apothecia 
rather elliptic, not branched, nearly parallel, growing star- 
like, branched and angular; border very slight. 
