LECANORA. | LECANO-LECIDEEI. 443 
or testaceo-reddish, the thalline margin thickish, crenate; spores 
ellipsoid, 0,009-11 mm. long, 0,006-8 mm. thick; paraphyses 
moderate, granulato-inspersed, not very discrete, epithecium brown- 
ish; hymenial gelatine bluish, then yellow (the thece tawny- 
yellow) with iodine.—Cromb. Journ. Bot. 1874, p. 148; Leight. 
Lich. Fl. ed. 3, p. 184. 
More closely allied to LZ. subventusa Nyl., a North-American plant, 
than to any British species of this section. In the two specimens seen 
_the thallus is more or less scattered, with the hypothallus scarcely visible. 
The apothecia in these are either scattered or crowded; the spermogones 
are seldom present. 
Hab, On granitic rocks in a maritime district—Distr. Only sparingly 
in the Channel Islands; (erroneously recorded by Leighton from N.W. 
Ireland).—B. M.: Vale Castle, Island of Guernsey. 
e. Thecee polyspored. 
133. L. Sambuci Nyl. Lich. Scand. (1861) p. 168.—Thallus 
effuse, very thin, granulose or subleprose, whitish or greyish, often 
nearly evanescent (Kf+ yellowish, CaCl—). Apothecia minute, 
plane, brown or reddish-brown, the thalline margin persistent, more 
or less crenulate, white ; spores 12-16—3zne (rarely 8nz), ellipsoid, 
0,008-12 mm. long, 0,005-7 mm. thick ; hymenial gelatine bluish, 
then pale-violet with iodine.—Carroll, Journ. Bot. 1866, p. 23; - 
Cromb. Lich. Brit. p. 53; Leight. Lich. Fl. p. 186, ed. 3, p. 171. 
A rather inconspicuous plant resembling LZ. Hageni, from which it is 
well distinguished by the numerous spores. ‘These in the single British 
specimen seen are usually 12n~, though they vary in plants from other 
countries from 8ne to 32ne in the same apothecium. The thallus, 
when whitish, gives a positive reaction with K, as stated by Th. M. Fries 
(Lich. Scand. p. 248), but this is scarcely visible in our specimen, in 
which the thallus is nearly evanescent. 
Hab. On trunks of trees, chiefly poplars, in upland tracts.— Distr. Very 
sparingly among the 8. Grampians, Scotland, and in N.E, Ireland (co. 
Armagh.).—B, M.: Craig Calliach, Perthshire. 
F. Apothecia usually biatoroid; spores 8ne or 16nx, simple or 1-3- 
septate, colourless; hymenial gelatine variously tinged with 
iodine. Spermogones with simple sterigmata and arcuate 
spermatia. (Lecania Mass, Alcun. Gen. (1853) p. 12.) 
134. L. erysibe Nyl. Mém. Soc. Cherb. t. v. (1857) p. 114, Lich. 
Scand. p. 167.—Thallus effuse, thin, diffract, leproso-granulose, 
greyish- or greenish-olive, or sordid-greyish (K—, CaCl—). Apo- 
thecia small, innato-sessile, plane or convex, brownish-red or livid- 
testaceous, the thalline margin little distinct or evanescent; spores 
oblongo-ellipsoid, simple or often thinly 1-septate, 0,010-16 mm. 
long, 0,004-6 mm. thick; hymenial gelatine bluish with iodine.— 
‘4Lromb. Lich. Brit. p. 53; Leight. Lich. Fl. p. 228, ed. 3, p. 218.— 
