400 S4. Lathag. 3. HOMOTHALAME. Pi. ceil. aph. 
2. Lathagrium fiaccidum. Flaceid lathagrium. 
_ Thallus leaflike, membranaceous, smooth, blackish green: 
lobes separate, reverse ovate, bluntly divided, not jagged, 
weak, flexible; zpetfecia scattered, few, rather flat, reddish : 
edge thin, not cut. 
Lichen nisrescens, Ekrk. Pl. Cr. 10, 98. 
Lichen repestris, Seartz Meth. Musc. S7- 
Lichen flaccidu:, Achar. N. A. Stockh. 16, 14. 
Parmelia flaccida, Achar. Meik. Lich. 229. 
Collema flaccidum, Achar. Lick. Univ. 647. 
Among mosses on rocks exposed to the drip of water. 
3. Lathagrtum_furvum. Dusky lathagrium. 
Thallus leafiike. membranaceous, rather wrinkled, folded, 
blackish green, granular on both sides; lobes rounded 
irregularly, frequently wavey-crisped, not cut; apothecia 
scattered, flat, blackish brown, edge not cut. 
Lichen granulosus, Fl. Dan. 462. 
Lichen furvus, Ackar. N. 4. Stockh. 22, 164. 
Parmelia furva, Achar. Meik. Lich. 230. 
Collema granulosum, Hoffm. Fi. Germ. 99. 
Collema forvem, Ackar. Lich. Univ. 650. 
On the bark of old trees, rocks, walls, and wooden roofs. 
4. Lathagrium stmuatum. Jagged lathagrium. 
Thallus leaflike, membranaceous, tiledlike, congregated, 
naked, black; Joles deeply jagged, crisp, toothed; apothecia 
scattered, sessile, colour of the thallus, edge not cut. 
Lichenoides tenue crispum, foliis parvis depressis, Dillen. Muse. 145. 
Lichen sinuatus, Huds. Pl. Aust. 509: Engi. Bot. 172. 
Gollema sinuatam, Heffm. Fl. Germ. ddd. 
Parmelia scotina sinuata, Achar. Wath. Lich. 257. 
Collen2 scotinum sinuatum, 4char. Lich. Univ. 652. 
Among grass and moss on the ground. 
VL 35. LEPTOGIUM. Acharns. Leptogium. 
Thallus \eaflike; lobes rounded, membranaceous, very 
tender, naked, greyish green, nearly transparent; apothecia 
on very short pedicells. 
1. Leptogium tremelloides. Tremelia leptogium. 
Thallus \eaflike, membranaceous, very tender, nearly 
transparent, lead colour, slightly wrmkled and hollow dot- 
ted: lobes oblong, rounded, cut, smooth-edged: apothecia 
scattered, with short pedicells, fiat, reddish brown, after- 
wards black, edge pale. 
