510 LICHEN AUEI. [PERTUSARIA. 
Form hexaspora Nyl. Lich. Scand. (1861) p. 182.—Spores 
usually 6nex, 0,038-86 mm. long, 0,025-38 mm. thick. Otherwise 
as in the ‘type. 
Differs merely in the thece being generally 6-spored, though in the 
same apothecium they are occasionally 4-spored. Nylander (/. ¢.) says 
the spores are rarely 3nz, which is not the case in our specimens. 
Hab. On trunks of trees in maritime and upland wooded situations. 
—Distr. Only a few localities in S. and W. England. —B. M.: Shanklin, 
Isle’ of Wight; near Lyndhurst, New Forest, Hants; Ullacombe, Bovey 
Tracey, 8S. Devon; Oakley Park, Cirencester, Gloucestershire. 
29. P. glomerata Schaer. Spicil. (1823) p. 66.—Thallus effuse, 
thin, interruptedly plicato-verrucose, white or yellow-cream-coloured, 
the fertile verrucw subglobose, conglomerate (K+ bright yellow, 
then cinnabar-red, CaCl—). Apothecia usually solitary, the ostioles 
punctiform or slightly dilated, generally somewhat prominent, 
blackish ; spores 0,072-125 mm. long, 0,028-44 mm. thick.— 
Mudd, Man. p. 277; Cromb. Lich. Brit. p, 60; Leight. Lich. Fl. 
p. 237, ed. 3, p. 227.—Lichen glomeratus Schleich. Pl. Crypt. Cent. 
iii. (1807) n. 77, fide Ach. Lich. Univ. p. 310 (sub Porina), Per- 
tusaria glomulifera (Borr.) Leight. Lich. Fl. p. 248, ed. 3, p. 234, 
Angio. Lich. p. 30, t. 11. f. 2, is only an old dealbate state in which 
the reaction with K is absent. 
An alpine plant well distinguished from its allies by the characters 
given and by the habitat. The thallus, scarcely contiguous, is itself 
white (K—), as noted by Th. M. Fries (Lich. Scand. p. 315); but the 
fertile verrucee, which are occasionally 2-38 concrescent, are more or less 
ochroleucous. The few British specimens are well fertile, the ostioles 
being at times two and often subpapillate. The spermogones, rarely 
present, have the spermatia aciculari-fusiform, 0,008-11 mm. long, 
0,0005 mm. thick (fide Nyl.). 
Hab. Incrusting dead mosses at high altitudes on mountains.— Distr. 
Local and scarce on the S. Grampians, Scotland.—B. M.. Craig Calliach 
and Ben Lawers, Perthshire. 
30. P. xanthostoma Fr. Lich. Eur. (1831) p. 427.—Thallus 
effuse, thin, smooth, milk-white, the fertile verruce elevated, 
depresso-subglobose (K—, CaCl—). Apothecia punctiform, usually 
1-2 in each verruca; the ostioles depressed, pale or pale-yellowish ; 
spores ellipsoid or ellipsoideo-oblong, 0,060-76 mm. long, 0,034—40 
mm, thick.—Cromb. Journ. Bot. 1875, p. 141; Leight. Lich. Fl. 
ed. 3, p. 235.—Porina xanthostoma Somm. in Vet. Ak. Handl. 
1823, p. 115. 
Has at first sight a considerable resemblance to Lecanora poriniformis 
Nyl. The verrucze sometimes occur 2-3 together, and the ostioles are 
occasionally tinged pale-reddish. Rarely 1-5 apothecia are seen in 
each verruca. 
Hab. On old stems of Ericas in alpine and subalpine localities.— Distr. 
Sparingly on the N. Grampians and in the N. Highlands of Scotiand — 
B. M.: Morrone, Braemar, Aberdeenshire ; near Lairg, Sutherlandshire. 
