LECANOR.V.] LrCAXO-LECIDBRT. 393 



57. L. leucospeirea Xyl. Flora, 1808, p. 473. — Thalliia fliinly 

 squamulose, wliite, opafiuo, the sijuainulea subcrcnato, adnate, 

 scattered, often granuliform (K — , CaCl — ). Apothecia plane, 

 brown, subopaijue, the thalline marj^in entire, white ; spores oblong 

 or ovoideo-oblouf?, 1-septatc, 0,011-13 mm. long, about 0,0035 mm. 

 thick; parapbyses slender, yellow-in fuscate at the apices ; hymenial 

 gelatine bluish, then violet-coloured, with iodine. — Cromb. Lich. 

 Erit. p. 48 ; Leight. Lich. Fl. p. 227, cd. 3, p. 218. 



Allied to var. /3 of the preceding species, with which it agrees in the 

 spernidgonos and other analytical characters, but differs in the white, 

 scattered, little developed thallus and in the form of the smaller spores. 

 Nylander says that it may be only a subspecies of L. hAoplicea, which in 

 some habitats may readily pass into dissimilar secondary types. The 

 fragmentary specimen seen is but sparingly fertile. 



Kah. On gravelly soil in a maritime district. — Dintr. Very rare in one 

 of the Channel Islands. — B. M. : Buulay Bay, Island of Jersey. 



58. L. Ralfsii Cromb. Grcvillea, ii. (1873) p. 13.— Thallus sub- 

 determinate, thin, continuous or slightly rimulose, frequently 

 rimobo-subcolliculose, smooth, leaden-grey or dark olive-green (K — , 

 CaCl — ) ; hyi)othallus dark. Apothecia rather small or minute, 

 biatoroid, sessile, somewhat prominent, plane, brownish or dark- 

 reddish-brown, the margin thin, at length excluded ; spores oblongo- 

 ellipsoid, often slightly constricted in the middle, 0,018-23 mm. 

 long, 0,006-9 mm. thick; parapbyses discrete or subdiscrete, jointed, 

 brownish at the apices ; hymenial gelatine bluish, then violet- 

 coloured, with iodine.- — Leight. Lich. Fl. ed. 3, p. 220 (excl. syn. 

 L. actcea). — Lecidea Ralfsii Salw. Ann. Penzance Xat. Hist. Soc. ii. 

 (1853) p. 144. Biatorina Muddii (Salw.), Mudd, Man. p. 178. 

 Lecidea Muddii Cromb. Lich. Brit. p. 37; Leight. Lich. Fl. p. 315. 

 Lecanora jejuna Xyl. Flora, 1875, p. 442 ; Cromb. Grevillea, iv. 

 p. 181. Lecidea sidjdihifa Leight. Trans. Linn. Soc. Bot. i. p. 145, 

 t. 22. figs. 13-16 ; Lich. Fl. ed. 3, p. 340.— Brit. Exs. : Larb. Lich. 

 Hb. nos. 134, 346. 



A species hitherto not well understood, as may be inferred from the 

 variety of synonyms, originating in slight dilferences of the thallus and 

 apothecia which depend upon age or habitat. In general appearance of 

 the thallus, as noticed by Nylander /. <?., it approaches L. gibbosa, and in 

 that of the apothecia it is subsimilar to Lecidea coarctata. From the 

 presence of gonidia in the margin of the apothecia and fi-om the structure 

 of the spermogones, it is a true Lecanora of this section. It often grows 

 associated with L. prosechoides and is usually well fertile. The spermo- 

 gones are fi-equent, with sperniatia elhpsoideo-oblong 0,002 mm. long, 

 0,0000 mm. thick. 



Hub. On granitic and schistose rocks in maritime tracts, — Disfr. Local 

 in the Channel Islands, S.W. and X."\V. England, the S.W. Highlands 

 and N.E. Scotland, and in N.W. Ireland.— B.M. : Boulay Bay, Island of 

 Jersey. Scilly Islands, the Lizard and near Penzance, Cornwall ; Ban-ow- 

 mouth, Cumberland. Barcaldine, Argyleshire ; Bay of Nigg, Kincardine- 

 shire. Killery Bay, Connemara, co. Galway. 



