396 80 . Placynth. 3 . HOMOTHALAMEiE. Pl.celLaph . 
Lichen niger, Hudson FI. Angl. 524; Engl. Bot. 1161. 
Lecidea corallinoides, Florke , Berl. Mag. 1809, 5. 
Lecidea nigra, Achar. Meth. Lich. 76. 
Stereocaulon corallinoides, Hoffm. FI. Germ. 129. 
Collema nigrum, Achar. Lichen. TJniv. 628. 
On rocks, espcially limestone. 
II. 81 . ENCHYLIUM. Acharius. Enchyle . 
Thallus plaited tilewise, nearly orbicular, composed of 
minute lobes, when moist turgid, very thick. 
1 . Enchylium microphyllum. Small-leaved enchyle. 
Thallus slightly spreading, tilewise, blackish green; lobes 
thick, minute, crowded, deeply crenate; apothecia sessile, 
crowded, pitchershape, hollow, colour of the thallus, edge 
not in the least cut, contracted. 
Collema microphyllum, Achar. Lich. TJniv. 630, 
On the bark of old trees. 
2 . Enchylium fragrans. Sweet-scented enchyle. 
Thallus nearly orbicular; lobes round, expanded, naked, 
edge thick, crenate, ascending; apothecia scattered, minute, 
hollow, dark yellowish brown; edge swollen outwardly, 
uneven. 
Lichen fragrans, Engl. Bot. 19, 12. 
Trunks of trees. 
When moistened has a sweet odour. 
3 . Enchylium crispum. Crisp enchyle. 
Thallus nearly orbicular; central lobes rather upright, 
granular; lobes of the circumference depressed, large, 
blunt, crenate; apothecia scattered, slightly concave, reddish, 
edge granular. 
Lichenoides gelatinosum atrovirens, crispum et rugosum, Dillen Muse. 
139. 
Lichen trispus, Engl. Bot. 834. 
Lichen pulposus /3, Bernh. in Schrad. Journ. 1799. 
Parmelia crispa, Achar . Meth. Lich. 254. 
Collema crispum, Hoffm. FI. Germ. 100. 
Collema crenulatum, Hoffm. FI. Germ. 103. 
Collema glaucescens, Hoffm. FI. Germ. 105. 
Collema pulposum crispum, Achar. Lich. Univ. 652. 
On the ground among mosses, and on mountains. 
4 . Enchylium turgidum. Swollen enchyle . 
Thallus irregularly expanded, depressed, slightly lobed 
and tiledlike; lobes raised, thick, wartlike, wrinkled, gra- 
