COLLEMA.] COLLEMKI. 4'J 



Ilah. On sandy soil in maritime tracts. — Distr. Local and rare ; tin- 

 Channel Islands and S.W. England. — JJ. M. : Coast of Ilerni. St. Minvcr, 

 Cornwall. 



14. C. concinnum Plot. Linntca, 1849, p. 361 ; 1850, p. 157. 

 — Thallus somewhat small, orbicular, variously inciso-lobed, olive- 

 brown or dark-glaucous ; lobes narrow, round, more or less ascending 

 or depressed. Apothecia submoderate, plane, reddish, the margin 

 entire; spores ovoid, 3-septatc or submurali-locular, 0,014— iiO mm. 

 long, 0,000-9 mm. thick.— Cromb. Journ. Eot. 1882, p. 272. 



From C. crispum this is distinguished by the smaller thallus and spores. 

 The British specimens belong chietiy to 0. dcplanatum Flot., with the 

 lobes depressed, but this is evidently a mere state. The apothecia are 

 numerous, nearly moderate, or smaller, with the margin sometimes in- 

 curved. 



Hab. On rocks and wall-tops in maritime districts. — DUtr. Local and 

 rare in S.W. England, N. Wales, and W. Ireland ; but no doubt occurring 

 elsewhere. — B. M. : Plymouth, S. Devon ; near Penzance, Cornwall ; 

 Barmouth, Merionethshire. Achanm-e Castle, co. Galway. 



15. C. cheUeum Ach. Liob. Univ. (1810) p. 630.— TliaUus imbri- 

 cato-lobed or crenato-granulose, greenish-black or dark-olive ; lobes 

 round, or minute and crenate, variously divided. Apothecia mode- 

 rate, or somewhat large, plane, dark-reddish, the thalline margin 

 granulato- crenate : spores oblongo-ellipsoid, 3-septate or submurali- 

 divided, 0,025-40 mm. long, 0,010-16 mm. thick.— Sm. Eng. Fl. 

 V. p. 208 ; Mudd, Man. p. ^40, t. i. f. 4; Cromb. Lich. Brit. p. 6 ; 

 Leight. Lich. Fl. p. 20, ed. 3, p. 2(). — Lichen cheihus Ach. Prodr, 

 (1798) p. 134. EncJi;/lium crisimm Gray, Xat. Art. i. p. 396. 

 Lichen cnspvs Huds. Fl. Angl. p. 447 ; Lightf. F'l. Scot. ii. p. 820 ; 

 With. Arr. ed. 3, iv. p. 76. Lichen raarrjinatus Bernh., Dicks. Crypt, 

 fasc. iv. p. 2.5. Lichenoides r/elatinosum atro-virens, crispum et 

 rtujosiim Dill. Muse. 139, t. 19. f. 23. — Hudson's name, Liclien cris- 

 ^>??.<, has priority, but to set aside the established name of Acharius 

 would lead to great confusion. — Brit. Exs. : Mudd, n. 3 ; Larb. 

 Caesar, n. 52, Lich. Hb. n, 2u3. 



The thallus is occasionally somewhat effuse, and varies in the character 

 of the lobes, being either determinate and orbicular, lobate, with the lobes 

 very small in the centre and explanate at the circiuuference, or some- 

 times little developed and crenato-granulose. The gonimia are usually 

 scattered, though some are occasionally moniliform, and the iilaments 

 are but scanty. The apothecia are chiefly centi'al, with the margin 

 persistent. 



Hab. On the mortar of old walls, rarely on calcareous rocks, chieflv in 

 upland situations. — Distr. General and usualh' common in the Channel 

 Islands, and most paits of Great Britain and Ireland, but frequently 

 barren. — B. M. : Quenvais, Island of Jersey. Thetford, Norfolk; Wal- 

 thamstow, Essex ; Shankliu, Isle of Wight ; near Phmouth, Devonshire; 

 St. Minver, Cornwall ; Bathanipton Downs, Somersetshu-e ; Milton. Ox- 

 fordshire ; near Cirencester, (Gloucestershire; Cradley, near Malvern, 

 Worcestershire ; Oswestry, Shropshu-e ; near Barmouth, Merioneth ; 



T. 



