210 LICHENES. 



[Collema. 



Sm. — Ach. Syn. p. 314. — Lichen fiuviatilis, Huds. — E. Bot. 

 t. 2039. —Dill. Muse. t. 19./. 28. 



On calcareous rocks, in the stream near its source, at Malham Cove, 

 Yorkshire. Snowdon, DUlenius. 



12. C. muUipartitum, Sm.* (many -branched Collema); thallus 

 radiating- fleshy, segments repeatedly forked fan-shaped crenate 

 convex above concave beneath, apothecia prominent at length 

 blackish and flat. E. Bot. t. 2582. 



On walls and rocks, Killarney, Ireland, abundant, Sir T. Gage. West- 

 moreland, Sir J. E. Smith. 



13. C. margindle, (marginal Collema); thallus imbricated 

 olive-black, its lobes linear parallel zigzag channelled crisped 

 crenate branched smooth, apothecia marginal dark reddish- 

 brown with an entire border. — Lichen marginalis, Huds. — 

 E. Bot. t. 1924. — Collema melcenum, (3. Ach. Syn. p. 316. — 

 Dill. Muse. t. 19./. 25. 



On calcareous stones, in moist places, often among mosses. 



14. C. fasciculdre, Ach. (clustered Collema); thallus sub- 

 orbicular the lobes dilated upwards plaited waved inciso-cre- 

 nate, apothecia marginal shortly stalked clustered turbinate 

 reddish. Sm. — Ach. Syn. p. 317. — Lichen fascicularis, Linn. — 

 E. Bot. t. 1162.— Dill. Muse. t. 19./ 27. 



On the mossy trunks of trees : frequent in Scotland.— The lobes of 

 the thallus are often obliterated by the exceedingly numerous apothecia. 



15. C. ? corrugation, Ach. (corrugated Collema); gelatinous 

 thick black-green with elevated intestiniform convolutions. 

 Dicks. — Ach. Syn. p. 318. — Lichen corrugatus, Dicks. Cr. 

 Ease. 4. p. 26.— Dill. Muse. t. 19./ 19. 



On rocks near the sea, Sussex, JDillenius. On rocks and stones, 

 Dickson. — Nothing seems to be known of this by any living Botanist. 

 It is probably a marine production and far removed from any Lichen. 



16. C. cretdceum, Ach. (Chalk Collema); thallus minute 

 lobed simple stellated dark-olive bearing a central solitary ele- 

 vated brownish flesh-coloured apothecium with a paler elevated 



entire border. Sm Ach. Syn. p. 328 Lick, cretaceus, E. Bot. 



t. 738. 



^ Common on chalk and on the white coating of flint-stones, Smith. — 

 This appears to be a young state of some other species, probably of C. 

 tcnuissimum. 



*** Thallus somewhat foliaceous, thin, lobed principally in the 

 circumference. 



17. C. palmdtum, (palmated Collema); thallus tufted nearly 

 erect greenish-brown its segments thin linear many-lobed some- 

 what palmate revolute, apothecia scattered reddish. Sm. — 

 Lichen palmatus, Huds. — E. Bot. t. 1635. — Collema palmatum, 

 (3. (not a.) Ach. Syn. p. 319. — C. comiculatum, Hoffm.—Dill. 

 Muse. t. 19,/ 30. 



Upon the ground, among mosses. Sandy soil by the sea, near Yar- 

 mouth, abundant, Mr. D. Tamer. 



