40 COLLEMACEI. [COLLEMA. 



granulate at the circumference, blackish-green or black. Apothecia 

 small, reddish, the margin somewhat tumid ; spores eUipsoid, 0,020 

 -24 mm. long, 0,008-13 mm. thick (or sometimes rather smaller), 

 paraphyses slender, scarcely articulate. Nyl. Syn. i. p. 104 ; 

 Carroll, Journ. Bot. 1866, p. 22; Cromb. Lich. Brit. p. 4; Leight. Lich. 

 Fl. p. 17, ed. 3, p. 16. To this apparently is referable C. maritimum 

 Tayl. Hook. Journ. Bot. 1847, p. 194. 



In a moist state, when not fully developed, this might readily be taken 

 for a Nostoc. The thnllus, which is variable, is closely agglutinate to 

 the substratum, with the lobes corrugato-difform, plicate, appressed, and 

 usually more or less verrucoso-granulose. The apothecia, though nume- 

 rous, are inconspicuous in the dry plant, being submersed in_ the small 

 thalline verruca?. The spermogones are not unfrequent, with simple 

 cylindrical sterigmata; spermatia thin, obtuse at either apex, 0,0025 mm. 

 long, scarcely 0,001 mm. thick. 



Hab. Among mosses on the ground in maritime and upland districts. 

 Distr. Apparently local and rare in S.W. England, N. Wales, the S.W. 

 Highlands, Scotland, and in S.W. Ireland. B. M. : Lipsom Hill, near 

 Plymouth, Devonshire ; Cheddar Cliffs, Somersetshire ; near Barmouth, 

 Merionethshire ; near Kendal, Westmoreland. Appin, Argyleshire. 

 Dunkerron, co. Kerry. 



2. C. cb.alazanod.es Nyl. Flora, 1869, p. 293. Thallus ditformi- 

 lobate or laciniate, crenulato-lobed at the margins, dark-green or 

 blackish. Apothecia small, reddish, the thalline margin tumid ; 

 spores in clavate thecae, ellipsoid or subglobose, small, 0,012-17 

 mm. long, 0,008-15 mm. thick. Cromb. Journ. Bot. 1869, 

 p. 105; Lich. Brit. p. 4 ; Leight. Lich. Fl. p. 17, ed. 3, p. 16. 



This is distinguished from the preceding species, to which it is closely 

 allied, by its much smaller and often subglobose spores. In the few 

 British specimens seen, the apothecia are numerous, but no spermogones 

 are visible. 



Hob. Among mosses on old walls in wooded upland tracts. Distr. 

 Very local and scarce in W. England, though it may occur in mountain- 

 ous "districts, as in Scandinavia, where it was discovered. B. M. : Bradley 

 Wood, Newton Bushell, S. Devon ; Coin Rogers, Gloucestershire. 



3. C. myriococcum Ach. Lich. Univ. (1810) p. 638. Thallus 

 imbricato-lobed, or at length almost crustaceo-difform, olive-green 

 or blackish ; lobes crowded, complicate, crisp. Apothecia minute, 

 numerous, aggregate in thalline tubercles, somewhat concave, red- 

 dish, the thalline margin tumid ; spores in cylindrical tnecse, 

 globose or subglobose, 0,009-12 mm. in diameter when globose, 

 or 0,011-12 mm. long, 0,009-10 mm. thick, when subglobose. 

 Nyl. Syn. i. p. 104, t, iv. f. 21 ; Cromb. Journ. Bot. 1874, 

 p. 146 ; Leight. Lich. Fl. ed. 3, p. 16. Lichen myriococcus Ach. 

 Prodr. (1798) p. 127. Brit. Exs. : Cromb. n. 3. 



This differs from C. chalazanum chiefly in the thallus being larger, the 

 lobes more developed, the apothecia more aggregate, and the spores more 



