COLLEMA. | COLLEMEI. 43 
1874, p. 333, Leight. Lich. Fl. ed. 3, p. 17, is a slightly thinner 
state of the species. 
The thallus is membranaceous in texture, and has rather small gonimia. 
From the allied species it is readily distinguished by the transversely 
rugulose lobes, and by the reaction with iodine ina thin section of the 
thallus, which takes place immediately on application. In the British 
specimens the apothecia are very rare. 
Hab. On rocks and old walls, chiefly calcareous, in upland districts.— 
Distr. Local and scarce in W., Central, and N. England, N. Wales, in 
the S.W. Highlands and the S. Grampians, Scotland. —B. M.: Paignton, 
8. Devon; Sherbrook and Cole Heath, Buxton, Derbyshire ; Island of 
Anglesea; Ashgill Force, Cumberland. Appin, Argyleshire; Killin, 
Perthshire. 
Subsp. C. granosum Nyl. ea Cromb. Grevillea, xv. (1886) p. 11.— 
Thallus smaller, thickish, more rigid, somewhat smooth or granu- 
late; lobes more elongate, variously incised, imbricate in the 
centre, crenate at the margins. Apothecia and spores as in tho 
type.—Collema dermatinum Borr. Eng. Bot. Suppl. t. 2716. f. 2 (two 
upper figs); Sm. Eng. Fl.v. p. 212; Mudd, Man. p.36. Leptogium 
dermatinum Leight. Lich. Fl. p. 29, ed. 3, p. 32. Lichen granosus 
Wulf. in Jacq. Coll. ili. (1789) p. 181, t.10. f. 2. Lichenoides gelu- 
tinosum atro-virens, auriculatum et granosum Dill. Muse. 140, t. 19. 
f. 24. 
This is well distinguished as a subspecies by the smaller subcoriaceous 
thallus and by the more incised, imbricate lobes. The apothecia are 
sessile and numerous on our fertile British specimens. 
Hab. On caleareous rocks and walls in upland districts —Distr. Local 
and scarce in W. England, N. Wales, and 8. W. Ireland.—B. M. : Cheddar 
Cliffs and opposite St. Vincent’s Rocks, Bristol, Somersetshire; near 
Cirencester, Glowcestershhice Pentragaer, Oswestry, Shropshire. Dun- 
kerron, co. Kerry. 
8. C. furvum Ach. Lich. Univ. (1810) p. 650.—Thallus roundly 
lobed, more or less granulate on both sides, dark greenish-brown or 
olive-black (I+ blood-red when dry); lobes irregularly. complicate, 
usually undulate and crisp, entire. Apothecia moderate, somewhat 
scattered, plane, brown, the margin entire; spores ovoid or ellipsoid, 
3-septate, becoming irregularly murali-locular, 0,018-24 mm. long, 
0,009-11 mm. thick.—Hook. Fl. Scot. ii. p. 72; Mudd, Man. p. 36; 
Cromb. Lich. Brit. p. 5; Leight. Lich. Fl. p. 24, ed. 3, p. 17.— 
Lathagrium furvum Gray, Nat. Arr. i. p. 400. Lichen furvus Ach. 
Prodr. (1798) p. 182. Collema granulatum Sm. Eng. Fl. v. p. 211; 
Tay]. in Mack. Fl. Hib. ii. p.110.. Lichen granulatus Huds. FI. 
Angl. ed. 2, p. 536, pro parte; With. Arr. ed. 3, p. 73, pro parte: 
_Eng. Bot. t. 1757. Lichenoides gelatinosum lobis crassioribus fusco- 
viridibus Dill. Muse. 188, t. 19. f. 22.— Brit. Exs.: Cromb. n. 102. 
The thallus, usually of moderate size, is either naked or more 
frequently granulato-furfuraceous, from the presence of numerous isidia, 
occasionally giving origin to young lobules. By our older authors 
