LECANORA. ] LECANO-LECIDEEL. 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. Ouly in ? N.E. 
England. B. M.: Hartlepool, Durham. 
Subsp. holocarpa Nyl. Lich. Scand (1861) p. 145.—Thallus nearly 
obsolete. Apothecia contiguous, crowded, vitelline or yellow- 
orange; sporcs 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 B. holocarpum Mudd, Man. p. 127 pro parte. 
Lichen holocarpus Ehrh. Crypt. (1798) n. 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 Roweliff, Loftus (saxicolous), Yorkshire ; 
Morpeth, Northumberland. Achmore, Killin, Perthshire. 
46. L. vitellinula Ny1. Flora, 1863, p. 305.—Thallus subeffuse, 
very thin, yellowish or vitelline-yellow (K+purplish). Apothecia 
small, biatorine, plane, margined, at length convex, vitelline (K+ 
purplish); spores polari-bilocular with longitudinal tube, 0,009- 
0,012 mm. long, 0,004-6 mm. thick—Cromb. Journ. Bot. (1882) 
p. 273. 
Closely allied to ZL. 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.—Dzstr. Onl 
sparingly in the Channel Islands, 8.W. and N. England, the S.W. 
Highlands of Scotland, and S.W. Iveland.—B. M.: Noirmont, Island of 
Jersey ; Sidmouth, Devonshire; Yatton and Weston-super-Mare, Somer- 
setshire ; Overend, Egremont, Cumberland. Island of Lismore, Argyle- 
shire. Carrigogumal, co. Limerick. 
47. L. luteoalba Nyl. ex Lamy, Bull. Soc. Bot. t. xxv. (1878) 
. 898.—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+ 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-alba Gray, Nat. Arr. 
i. p. 475; Hook. Fl. Scot. ii. p. 40. Lochen luteo-albus Turn. 
Trans. Linn. Soc. vii. (1804) p. 92; Eng. Bot. t. 1426. Lecanora 
pyracea var. ulmicola (DC.) Leight. Lich. Fl, p. 222, ed. 3, p. 211. 
Lecidea ulmicola Sm. Eng. Fl. v. p. 185.— Brit. Hus.: Leight. n. 84; 
Mudd, n.98; Cromb. n. 61; Larb. Lich. Hb. n. 168; Bohl. n. 76. 
2¢ 
