LECANORA. | LECANO-LECIDEET. 449 
lescens Cromb. Lich. Brit. p. 53; Leight. Lich. Fl. p. 231, ed. 3, 
p. 223.—Brit. Hvs.: Leight. n. 294; Mudd, n. 103. 
Closely allied to the preceding species, but among other characters, 
apart from habitat, separated by the thece being definitely 8-spored, the 
spores themselves being normally straight. Mudd describes the thallus 
of his plant, which is evidently only a state, as being leaden-greyish and 
tee both of which characters disappear in Herbaria specimens. 
The apothecia are numerous and aggregate, with the margin, when per- 
sistent, at length undulate and angulose from their confluence. 
Hab. On old walls in upland situations.—Distr. Very sparingly in W. 
and N. England.—B. M.: Preston, near Cirencester, Gloucestershire ; 
near Marske, Cleveland, Yorkshire. 
Var. 3. ceruleorubella Cromb.—Thallus thickish, granuloso- 
leprose, sordid-greyish or cesious. Apothecia innato-sessile, scat- 
tered, reddish or dark-red, the thalline margin whitish, persistent. 
—Lecania cerulescens, var. (3. eeruleorubella Mudd Man, (1861) 
p. 141, 
Probably a good variety, judging from the two specimens seen. It is 
characterized by the more pulverulent thallus, the less prominent, more 
scattered apothecia and their persistent thalline margin, otherwise it is 
similar to the type. 
Hab. On old walls (arenaceous) in an upland district—Distr. 
Extremely local and scarce in N. England.—B. Ma Near Ayton, Cleve- 
land, Yorkshire. 
142. L. dimera Nyl. Not. Sallsk. pro F. et Fl. Fenn. Férh. xi. 
(1871) p. 184.—Thallus effuse, very thin, greyish-white, or scarcely 
any visible (Kf+yellowish, CaCl—). Apothecia minute, biatorine, 
convex, pale- or dark-brownish, naked, the margin thin, evanes- 
cent; paraphyses not well discrete, brownish at the apices; epi- 
thecium K-+ pale rose-coloured ; spores 8nz, oblong or subellipsoid, 
1-septate, usually somewhat curved, 0,012-18 mm. long, 0,004-6 
mum. thick; hymenial gelatine bluish, then wine-reddish or violet 
with iodine.—Cromb. Grevillea, xviii. p. 70.—Lecanora uthroocarpa 
subsp. dimera Nyl. Lich. Scand. (1861) p. 169. 
Might readily be taken for Z. syringea but for the number of the less 
divided spores. In the single British specimen, which is well fertile, 
the thallus forms small, somewhat scattered maculw on the substratum. 
The young apothecia are distinctly lecanorine, but the thalline marvin 
speedily disappears. 
Hab. On the smooth bark of a mee in an upland district.— Distr. 
As yet only very sparingly in the N. Grampians, Scotland.—B. M.: 
Morrone, Braemar, Aberdeenshire. 
143, L. rhypariza Nyl. Ofvers. Vet.-Ak. Férh. 1860, p. 296; 
Lich. Scand. p. 169.—Thallus effuse, granulose or granuloso- 
squamulose, pale, or pale-lurid-greyish, the granules (or squa- 
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