358 CYCLOCARPINEA [PERTUSARIA 
cracked-areolate and warted, greyish-white (K+yellow then 
orange-red). Apothecia innate in the somewhat flattened warts, 
the disc rather wide, uneven, brownish, white-pulverulent, the 
thalline margin thick, entire or furrowed ; spores one in the 
ascus, 150-235 p long, 78-80 pw thick——Cromb. in Grevillea xix. 
p- 59 (1891) & Monogr. i. p. 494. 
Easily distinguished by the reaction with potash and by the single- 
spored asci. P. dealbata, with which it has been compared, has 
almost the same reaction (less intensely red), is more generally 
isidiose and has a 2-spored ascus. 
Hab. On schistose rocks.—2. M. Cader Idris, Merioneth (the 
only British record). 
Thallus more or less sorediate. 
4. P. bryontha Nyl. Lich. Scand. p. 178 (1861).—Thallus 
effuse, rather thin and spreading, or often consisting of subglobose 
fertile granules, which are sometimes sorediate, white or greyish- 
white (K+yellowish, soredia CaCl+reddish). Apothecia at 
first closed, then with a plane open disc up to 2 mm. across (in 
Brit. specimen), fawn-coloured, then cinereous-black, the thalline 
margin prominent, then almost excluded ; spores one in the 
ascus, 120-230 p» long, 40-70 p thick, or sometimes smaller.— 
Cromb. Lich. Brit. p- "58 & Monogr. i. p. 492 ; Leight. Lich. FI. 
p. 240; ed. 3, p. 230.  P. macrospora Hepp Flecht, Eur, n. 424 
(1857) ; Mudd Man. p. 277. Parmelia subfusca var. bryontha 
Ach. Meth. Lich. p. 167 (1803). 
One of our rarest lichens. Reactions are sometimes given as 
CaCl+ orange-red, but I have been unable to verify that on our 
specimen. 
Hab. On the ground encrusting mosses amd decayed plants, in 
alpine places.—Dzstr. Local and scarce among the N. Grampians, 
Scotland.—B. M. Cairngorm and Ben-naboord, Braemar, Aberdeen- 
shire. 
5. P. ophthalmiza Nyl. in Flora xlviii. p. 354 (1865).—Thallus 
effuse, thin, smooth or granulate, unequally wrinkled, light- 
cinereous-grey (K—, CaCl—). Fertile verruce small, scattered 
or generally crowded, containing 1, rarely 2—3, apothecia, the disc 
fairly open, blackish, the outer margin rugose or rarely subleprose ; 
spores one in the ascus, 160-205 pw long, 80-100 » thick.—Carroll 
in Journ. Bot. iv. p. 23 (1866); Leight. Lich. Fl. p. 242 ; ed. 3, 
p. 283; Cromb. Monogr. i. p. 496. P. velata subsp. multipuncta 
a ophthalmiza Nyl. “Lich. Scand. p. 180 (1861). P. globifera 
subsp. ophthalmiza Cromb. Lich. Brit. p. 59 (1870). 
Distinguished by the thinnish thallus and the small Lecanora- 
like fertile verrucee. The spores in the Glen Falloch specimens, 
evidently mature, measure only up to 175 p long, 55 » thick. Other- 
wise they correspond with N ylander’s description. 
