LECANOKA.] LECANO-LECIDEEI. 385 



British plant, though there are two specimens from Mr. Mudd in Herb. 

 Brit. Mus. purporting to have been gathered in the locality cited. 



Hab. On calcareous rocks in a maritime district. Distr. Only in ? N.E. 

 England. B. M. : Hartlepool, Durham. 



Subsp. holocarpa Nyl. Lich. Scand (1861) p. 145. Thallus nearly 

 obsolete. Apothecia contiguous, crowded, vitelliue or yellow- 

 orange ; sports 0,010-14 mm. long, 0,006-10 mm. thick. Cromb. 

 Grevillea, xviii. p. 46 ; Lich. Brit. p. 47 pro parte ; var. holocarpa 

 Leight. Lich. Fl. p. 222 pro parte, ed. 3, p. 211 pro parte. Callo- 

 pisma luteoalbum (3. liolocarpum Mudd, Man. p. 127 pro parte. 

 Lichen holocarpus Ehrh. Crypt. (1793) u. 284. 



Occasionally there are visible slight traces of a thin, dark-greyish, 

 granulose or subfurfuraceous thallus, which, however, is probably not 

 proper. The apothecia are very numerous and crowded, so that, from 

 mutual pressure, they become angular. 



Hab. On old pales, very rarely on rocks, in lowland and upland situa- 

 tions. Distr. Seen only from a few localities in Great Britain. B. M. : 

 Near Ayton, Cleveland and Rowcliff, Loftus (saxicolous), Yorkshire ; 

 Morpeth, Northumberland. Achmore, Killin, Perthshire. 



46. L. vitellinula Nyl. Flora, 1863, p. 305. Thallus subefl'use, 

 very thin, yellowish or vitelline-yellow (K + purplish). Apothecia 

 small, biatorine, plane, margined, at length convex, vitelline (K + 

 purplish); spores polar i-bilocular with longitudinal tube, 0,009- 

 0,012 mm. long, 0,004-6 mm. thick. Cromb. Journ. Bofc. (1882) 

 p. 273. 



Closely allied to L. pyracea, from which it differs chiefly in colour and 

 in the size of the spores. The thallus is at times nearly evanescent, and 

 the apothecia are usually numerous. Only saxicolous in Britain. 



Hab. On calcareous rocks in maritime and hilly tracts. Distr. Only 

 sparingly in the Channel Islands, S.W. and N. England, the S.W. 

 Highlands of Scotland, and S.W. Ireland. B. M. : Noirmont, Island of 

 Jersey ; Sidmouth, Devonshire ; Yatton and Weston-super-Mare, Somer- 

 setshire ; Overend, Egrernont, Cumberland. Island of Lismore, Argyle- 

 shire. Carrigogumal, co. Limerick. 



47. L. luteoalba Nyl. ex Lamy, Bull. Soc. Bot, t. xxv. (1878) 

 p. 398. Thallus effuse, thin, leprose, greyish- white (K ), 

 often almost obsolete. Apothecia minute, biatorine, orange-yellow, 

 at first innate, plane, with paler entire proper margin, at length 

 convex and immarginate (K -j- purplish) ; spores ellipsoid, 1-septate, 

 0,009-11 mm. long, 0,004-5 mm. thick; paraphyses not very 

 discrete. Cromb. Grevillea, xviii. p. 46. Callopisma luteo-album 

 Mudd, Man. p. 136 pro parte. Lecidea luteo-cdba Gray, Nat. Arr. 

 i. p. 475 ; Hook. Fl. Scot. ii. p. 40. Lichen luteo-albus Turn. 

 Trans. Linn. Soc. vii. (1804) p. 92; Eng. Bot. t. 1426. Lecanora 

 pyraceav-dT. ulmicola (DC.) Leight. Lich. Fl. p. 222, ed. 3, p. 211. 

 Lecidea ulmicola Sm. Eng. Fl. v. p. 185. Brit. Exs. : Leight. n. 84 ; 

 Mudd, n. 98 ; Cromb. n. 61 ; Larb. Lich. Hb. n. 168 ; Bohl. n. 76. 



2c 



