LECANORA. | LECANO-LECIDEEI. 393 
57. L. leucospeirea Nyl. Flora, 1868, p. 473.—Thallus thinly 
squamulose, white, opaque, the squamules subcrenate, adnate, 
scattered, often granuliform (K—, CaCl—). Apothecia plane, 
brown, subopaque, the thalline margin entire, white; spores oblong 
or ovoideo-oblong, 1-septate, 0,011-13 mm. long, about 0,0035 mm. 
thick ; paraphyses slender, yellow-infuscate at the apices; hymenial 
gelatine bluish, then violet-coloured, with iodine-—Cromb. Lich. 
Brit. p. 48 ; Leight. Lich. Fl. p. 227, ed. 3, p. 218. 
Allied to var. 6 of the preceding species, with which it agrees in the 
spermogones 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. holophea, which in 
some habitats may readily pass into dissimilar secondary types. The 
fragmentary specimen seen is but sparingly fertile. 
Hab, On gravelly soil in a maritime district.—Diéstr. Very rare in one 
of the Channel Islands.—B, M.: Boulay Bay, Island of Jersey. 
58. L. Ralfsii Cromb. Grevillea, ii. (1873) p. 18.—Thallus sub- 
determinate, thin, continuous or slightly rimulose, frequently 
rimoso-subcolliculose, smooth, leaden-grey or dark olive-green (K—, 
CaCl—); hypothallus 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; paraphyses 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. acteea).— Lecidea Ratfsii Salw. Ann. Penzance Nat. Hist. Soc. ii. 
(1853) p. 144. Biatorina Muddii (Salw.), Mudd, Man. p. 178. 
Lecidea Muddiit Cromb. Lich. Brit. p. 87; Leight. Lich. Fl. p. 315. 
Lecanora jejuna Nyl. Flora, 1875, p. 442; Cromb. Grevillea, iv. 
p. 181. Lecidea subdiluta Leight. Trans. Linn. Soe. Bot. i. p. 145, 
t. 22. figs. 13-16; Lich. Fl. ed. 3, p.340.—Brit. Exs.: Larb. Lich. 
Hb. nos. 184, 346. 
A species hitherto not well understood, ay may be inferred from the 
variety of synonyms, originating in slight differences of the thallus and 
apothecia which depend upon age or habitat. In general appearance of 
the thallus, as noticed by Nylander J. ¢., it approaches ZL. 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 from 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 frequent, with spermatia ellipsoideo-oblong 0,002 mm. long, 
0,0006 mm. thick. 
Hab. On granitic and schistose rocks in maritime tracts.— Distr. Local 
in the Channel Islands, 8.W. and N.W. England, the 8.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; Barrow- 
mouth, Cumberland. Barcaldine, Argyleshire; Bay of Nigg, Kincardine- 
shire. Killery Bay, Connemara, co. Galway. 
