PERTUSARIA | PERTUSARIACEE BD7T 
it had been widely circulated for many years previously, and is quoted 
as early as 1812 in Smith’s ‘‘English Botany” (see Variolaria 
griseo-virens t. 2400). 
The species of Pertusarta have been arranged according to the 
prevailing number of spores in the ascus, it is not a constant 
character. 
A. Spores one in the ascus. 
Thallus non-sorediate. 
1. P. dactylina Nyl. in Act. Soc. Sci. Fenn. vii. p. 447 (1863) 
note 1.—Thallus thin, with crowded upright rounded stoutish 
papille about 1 mm. in height, simple or rarely divided or 
coalescent, whitish (K+ orange-yellow then red). Apothecia 
rather rare, immersed in the apices of the papille, the disc 
blackish, usually almost covered over ; spores one in the ascus, 
125-230 y» long, 65-85 » thick.—Cromb. Lich. Brit. p. 60 & 
Monogr. i. p. 493; Leight. Lich. Fl. p. 239; ed. 3, p. 230. 
Lichen dactylinus Ach. Lich. Suec. Prodr. p. 89 (1798). L. oculatus 
Sm. Engl. Bot. t. 1833 (1808) (non Dicks.). Rinodina oculata 
S. .F. Gray Nat. Arr. i. p. 449 (1821) (non Dicks.). 
Distinguished by the stoutish dactyloid papille, and by the 
reactions with potash. 
Hab. On the ground or on decayed mosses in alpine regions.— 
Dist. Confined to the summits of the Grampians, Scotland.—Bb. M. 
Ben Lawers, Perthshire; Morrone and Ben-naboord, Braemar, 
Aberdeenshire. 
2. P. Hutchinsie Leight. Angioc. Lich. p. 30, t. 11, fig. 1 (1851). 
—Thallus effuse, thickish, unequally wrinkled or warted, whitish 
or cream-coloured (K—). Apothecia immersed in the verruce, 
small or moderate in size, the disc well-exposed, depressed, 
brownish-black and greyish-pruinose, the margin thicker, some- 
what torn; spores one in the ascus, 80-165 yp long (or more), 
40-55 p thick—Mudd Man. p. 277; Cromb. Lich. Brit. p. 59 
& Monogr. i. p. 493; Leight. Lich. Fl. p. 243; ed. 3, p. 233. 
Thelotrema Hutchinsie Borr. Engl. Bot. Suppl. t. 2652 (1830) ; 
Hook. in Sm. Engl. Fl. v. p. 162; Tayl. in Mackay Fl. Hib. ii. 
p. 103; Turn. & Borr. Lich. Brit. p. 178. 
An endemic Irish species somewhat resembling Lecanora verrucosa 
though with larger thalline warts. Its nearest ally is Pertusaria 
panyrga Th. Fr. Lich. Scand. p. 308 (1871),.in which the thallus 
tends to become papillate. Crombie’s spore length, 80-120 yp, is too 
small, greater lengths have been observed more nearly approaching 
the dimensions of P. panyrga (110-220 yp). 
Hab. On the ground incrusting mosses and heaths.—B. M. Hills 
near Bantry, Cork. 
3. P. monogona Nyl. in Bull. Soc. Linn. Norm. sér. 2, vi. 
p. 289 (1872).—Thallus subdeterminate, thickish, wrinkled, 
