506 134. Hysterina. 5. IDIOTHALAME. Pil. cell. aph. 
6. Hysterina herpetica. Eruption slit-moss. 
Crust nearly membranaceous, very finely cracked and 
wrinkled, rather rough, grey-brown ; apothecia very small, 
innate in the crust, crowded, convex, elliptically oblong, 
rather long, straight; centre slitlike. 
Opegrapha herpetica, Achar. Meth. 25; Lick. 248. 
Opegrapha rubella decolorata, Achar. Meth. 21; Lich, 248. 
Opesrapha fuliginosa, Persoon in Act. Wetteraw, 2, 44. 
Opegrapha rimalis fuscata, Achar. Lich. 261. 
On the trunks of trees. 
7. Hysterina disparata. 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 znea, Persoon in Uster Ann. 7, 31. 
Opegrapha viridis, Persoon in Uster Ann, 7,31. 
Opegrapha rubella « and $, Achar. Meth. 21, 22. 
Opegrapha siderella enea, Achar. Meth. 26. 
Opegrapha rubella a, y and &, Achar. Lich. 249, 259. 
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 dispers2, 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- 
dike, branched and angular; border very slight. 
