LECAXOKA.] LECANO-LECIDEEI. 479 



Form melanocarpa Stiz. St. Gall. Nat. Ges. 1881, p. 383. 

 Thallus as in the type. Apothecia at length emersed, prominent, 

 black, the thalline margin obliterated. Cromb. Grevillea, xviii. 

 p. 58. Hymenelia Prevostii var. fi. melanocarpa Krempelh. Lich. Fl. 

 Bayer. (1801) p. 167. Lichen punctitus Eng. Bot. t. 450 (accord- 

 ing to the specimen figured in Hb. Sowerby and the diagnosis 

 given). Aspinlia epulotica var. ft. punctata Mudd, .Man. p. 161. 

 Urceolaria cyrtaspis Gray, Nat. Arr. i. p. 458 ? U. Acharii var. ft. 

 cyrtaspis Ach., Sm. Eng. Fl. v. p. 172. 



Though not described by Krempelh uber /. c., the British specimens 

 quite correspond with one from his own herbarium. Were it not that the 

 young apothecia are as in the type, it would form a good variety. When 

 the fruit is immersed it looks much like young states of Lecidea calcivora. 



Hub. On calcareous rocks in upland situations. Distr. Apparently 

 very local and scarce in S.W. and N. England, as also on the Central 

 Grampians, Scotland. B. M. : Bathampton Downs, Somersetshire ; Tees- 

 dale, Durham. Craig Tulloch, Blair Athole, Perthshire. 



Var. ft. affinis Nyl. ex Stiz. St. Gall. Nat. Ges. 1881, p. 385. 

 Thallus thin, pale-flesh-coloured or subochraceous. Apothecia very 

 minute, at length slightly emersed, pale-testaceous, the thalline 

 margin persistent: spores 0,014-18 mm. long, 0,009-13 mm. 

 thick. Cromb. Grevillea, xix. p. 58 (lapsu sub L. epulotica). Hyme- 

 nelia affinis Mass. Geneac. Lich. (1854) p. 13 ; Symm. Lich. p. 23. 



Regarded as a distinct species by Massalongo and others, this is only a 

 variety of L. Prevostii, with which it is subconfluent, differing only in the 

 more emergent apothecia and the size of the spores. In the British 

 specimens the thallus is at times slightly ochraceous. 



Hub. On calcareous and serpentine rocks in subalpine tracts. Distr. 

 Extremely rare in N. England and on the Grampians, Scotland. B. M. : 

 Teesdale, Durham. Craisr Tulloch, Blair Athole, Perthshire ; the Khoil, 

 near Ballater, Aberdeenshire. 



6. Gonidial system composed of chrysogonidia, large and concatenate, 

 with thickish, firm membrane or perigonidium. (lonaspis Fr. 

 fil. Lich. Scaud. i. (1881) p. 273.) 



179. L. epulotica Nyl. in Cromb. Lien. Brit. (1870) p. 55 (excl. 

 var.). Thallus determinate or subeffuse, thin or very thin, con- 

 tinuous or rimulose, pale or pale- whitish (K , CaCl ). Apothecia 

 innate, somewhat concave, submoderate, pale or pale- rose-coloured ; 

 the thalline margin thickish, often circumcised from the thallus ; 

 spores ellipsoid or subgloboso-ellipsoid, 0,018-20 mm. long, 0,010- 

 11 mm. thick; hymenial gelatine bluish with iodine. Leight. Lich. 

 Fl. p. 212 pro parte, ed. 3, p. 197 pro parte. Aspicilia epulotica 

 Mudd, Man. p. 161 pro parte, t. 3. f. 51. Gyalecta epulotica Ach. 

 Lich. Univ. (1810) p. 151, t. i. f. 7 (secundum specimen primarium 

 ex Anglia). 



Externally not unlike states of L. lacustris, with which it is apt to be 



