482 LICHENACEI. [LECANORA. 
Form 2. denudata Cromb. Grevillea, xix. (1891) p. 58.— 
Apothecia moderate or small, naked, brownish-red or chestnut- 
brown, the margin entire. 
The epruinose apothecia chiefly distinguish this form. Otherwise they 
are in some specimens moderate and crowded (form conferta Cromb. 
Journ. Bot. 1873, p. 134) ; while in others they are small and somewhat 
at (form conspersa Fr., “apotheciis minoribus,” Cromb. Grevillea, 
i. p. 171). 
Hab. On calcareous and schistose rocks in mountainous districts. —Distr. 
Found only in N. England and the Central and N. Grampians, Scot- 
land.—B. M.: Near Dent, Yorkshire. Craig Tulloch, Blair Athole, 
Perthshire ; Craig Guie, Braemar, Aberdeenshire. 
183. L. squamulosa Nyl. Flora, 1872, p. 554.—Thallus areolato- 
squamulose, opaque, cervine, pale badious or badious-brown ; 
squamules adnate, rounded at the margins, white beneath (K 
(CaCl)—). Apothecia somewhat large, plane, reddish- or dark- 
brown, the thalline margin usually depressed; spores oblongo- 
ellipsoid, 0,008-12 mm. long, 0,004-5 mm. thick; paraphyses not 
discrete, occasionally jointed, brownish at the apices; hymenial 
gelatine deep blue with iodine——Cromb. Grevillea, xix. p. 58; 
Leight. Lich. Fl. p. 183 pro parte, ed. 3, p. 169 pro parte.— 
Lichen squamulosus Schrad. Crypt. Exs. (1797) n. 153. Lecanora 
cervina (Pers.), Cromb. Lich. Brit. p. 56 pro minima parte. 
Acarospora cervina a. sqyuamulosa, Mudd, Man. p. 158 pro parte. 
Readily distinguished from the preceding species by the closely 
appressed thallus, the contiguous differently coloured squamules, as also 
by the thinner spores. It is not very variable, presenting only the form 
that follows. The apothecia are at first immersed and then become 
superficial. 
Hab, On calcareous rocks in mountainous districts.— Distr. Apparently 
very local and scarce in N. Wales, N.W. England, and on the Grampians, 
Scotland.—B. M.: Dolgelly, Merionethshire; near Staveley, Kendal, 
Westmoreland. Craig Tulloch, Blair Athole, Perthshire; Craig Guie 
and Morrone, Braemar, Aberdeenshire. 
Form albomarginata Cromb.—Thalline squamules densely white- 
pulverulent at the margins; otherwise as in the type. 
Analogous to form mosazca, Duf., Nyl., of L. castanea (Ram.), a plant 
which does not occur in this country. 
Hab. On calcareous rocks in a subalpine district Distr. Extremely 
rare on one of the Central Grampians, Scotland.—B. M.: Craig Tulloch, 
Blair Athole, Perthshire. 
184. L. perczenoides, Nyl. ea Wedd. Bull. Soc. Bot. xvi. (1869) 
p. 202.—Thallus verrucoso-squamulose, thickish, chestnut-coloured, 
white- or cesio-pruinose, the squamules convex, scattered or imbri- 
cate (K—,CaCl—). Apothecia innate, concave, irregular, rounded 
or difform, often crowded, reddish- or dark-brown, naked, the 
thalline margin prominent, whitish ; spores ellipsoid, 0,004-6 mm. 
