PERTUSARIA | PERTUSARIACEE 371 
C. Spores usually four in the ascus. 
Thallus non-sorediate. 
22. P. glomerata Scher. Lich. Helv. Spicil. p. 66 (1823).— 
Thallus effuse, thin, somewhat wrinkled, but consisting mostly of 
small subglobose crowded and sometimes confluent fertile 
verruce, white or faintly yellowish cream-coloured (K + yellow, 
then blood-red, CaCl—). Apothecia usually solitary, with 
punctiform or slightly open blackish discs; epithecium K + 
violet ; spores generally 4 in the ascus (sometimes 2 or up to 7), 
72-125 p long, 28-44 » thick.—Mudd Man. p. 277; Carroll in 
Journ. Bot. iii. p. 289 (1865); Cromb. Lich. Brit. p. 60 & 
Monogr. i. p. 510; Leight. Angioc. Lich. p. 73 note & Lich. 
Fl. p. 237; ed. 3, p. 227. P. glomulifera Borr. ex Leight. Lich. 
Fl. p. 243 (1871); ed. 3, p. 234. Lichen glomeratus Schleich. 
Pl. Crypt. Cent. iii. n. 77, in Schrad. Neu. Journ. Bot. i. 2, 
p- 199 (1806) nomen nudum. Porina glomerata Ach. Lich. 
Univ. p. 310 (1810). 
An alpine lichen, sufficiently’ distinguished from other ‘‘moss”’ 
species by the number of spores and by the reaction with potash. 
The violet reaction of the epithecium is well marked, suggesting 
affinity with P. Wulfeniw. It is described and figured without a 
name in Leight. Angioc. Lich. p. 30, t. xi. fig. 2 (1851). 
Hab. Encrusting dead mosses in mountainous places.—Distr. 
Rare in the Scottish Grampians.—B. M. Craig Calliach and Ben 
Lawers, Perthshire. 
23. P. leioplaca Scher. Lich. Helv. Spicil. p. 66 (1823).— 
Thallus thin, developed above or within the outer periderm 
layers, subdeterminate, smooth or with scattered unequal slight 
wrinkles and cracks, white or yellowish-white (K — or f + 
yellowish). Fertile verruce numerous, scattered, prominent, 
smooth, the apothecia 1-5 in each verruca, with pale or dark 
punctiform ostioles ; spores normally 4, uniseriate in the ascus, 
sometimes varying in the same hymenium from 2 to 6 or even &, 
ellipsoid, variable in size, 42-110 » long, 20-40 » thick.—Mudd 
Man. p. 276; Cromb. Lich. Brit. p. 60 & Monogr. i. p. 509 
(incl. var. hexaspora Nyl. Lich. Scand. p. 182 (1861) ) ; Leight. 
Lich. Fl. p. 244; ed. 3, p. 234. P. communis var. leioplaca 
Turn. & Borr. ex Scher. 1. c. & Lich. Brit. p. 197. Porina 
leioplaca Ach. in K. Vet. Acad. Handl. xxx. p. 159 (1809) & 
Lich. Univ. p. 309, t. 7, fig. 2 (1810) (excel. vars.). 
Ezxsicc. Johns. n. 157 ; Leight. n. 230 ; Mudd nos. 265, 267. 
Distinguished by the thin, partly hyphophleodal, thallus and by 
the normally 4-spored ascus. Very rarely, there are 8 spores present, 
which are then smaller (var. octospora Nyl. Lich. Scand. p. 182 (1861 ; 
Wheld. & Trav. in Journ. Bot. li. p. 251) (1913) ). The reaction with 
potash, according to Th. Fries (Lich. Scand. p. 316), is less pro- 
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