384 LICHENACEI. [LCANORA. 
Argyleshire; Ben Lawers, Perthshire; Rothiemurchus and near Fort 
William, Inverness-shire. Ballynahinch, Connemara, co. Galway; 
Westport, co. Mayo. 
Form submersa Nyl. Flora, 1885, p. 43.—Thallus thin, dark, at 
length rimuloso-diffract; otherwise as in the type.--Cromb. 
Grevillea, xviii. p. 46. 
Differs merely in the character of the thallus, which is probably owing 
to the habitat. TI have not seen a British specimen. 
Hab. On stones in streams in upland situations.—Distr. Very sparingly 
in N.W. Ireland (near Kylemore, Connerhara, co. Galway). 
Var. 6. pyrithroma Nyl. Bull. Soc. Bot. t. xiii. (1866) p. 367.— 
Thallus paler, often scarcely visible. Apothecia somewhat convex, 
deep-yellow or reddish ; spores 0,010-13 mm. long, 0,004—5 mm. 
thick.—Cromb. Grevillea, xviii. p. 46; Lich. Brit. p. 47.—Lecidea 
rupestris (>. pyrithroma Ach. Lich. Univ. (1810) p. 206.—Brit. 
Exs.: Larb. Lich. Hb. n. 335. 
Differs chiefly in the size of the spores. It usually occurs athalline and 
mixed up with other crustaceous lichens, so that it is apt to be over- 
looked. , 
Hab. On rocks, walls, and flints in lowland and upland tracts.—Distr, 
Seen from only a few localities in Great Britain and N.W. Ireland. 
—B. M.: Thetford Warren, Norfolk; Kildale, Cleveland, Yorkshire. 
Craig Tulloch, Blair Athole, Perthshire; Park, near Aberdeen; Craig 
Guie, Braemar, Aberdeenshire. Lough Inagh, Connemara, co. Galway. 
Form picta Cromb. Grevillea, xviii. (1889) p: 47.—Thallus thin, 
greyish, evanescent. Apothecia concave, then plane, pale greenish- 
dun coloured, yellow-pruinose, the proper margin thickish, inflexed. 
—Lecidea picta Tayl. in Mack. Fl. Hib. ii. (1836) p. 180.—Leca- 
nora pyracea var. pyrithroma Leight. Lich. Fl. p. 222, ed. 3, 
p. 212.—Brit. Kws.: Larb. Lich. Hb. n. 55. 
Only a form of var. 8, distinguished chiefly by the bright-yellow 
pruina with which the fruit is covered. In specimens long preserved 
in Herbaria this disappears. The apothecia are minute or somewhat 
small, numerous and usually crowded. 
Hab. On schistose rocks in mountainous regions.—Distr. Local and 
scarce on the S. Scottish Grampians and in W. Ireland.—B, M.: Ben 
Lawers and peg ee Perthshire. Carig Mt., co. Kerry; Lettermore, 
Connemara, co. Galway. 
Var. y. lactea Stiz. St. Gall. Nat. Ges. 1881, p. 852.—Thallus 
thinnish, amylaceous, chalky-white. Apothecia small, orange-red, at 
length convex and immarginate.—Cromb. Grevillea, xix. p. 60.— 
Callopisma luteo-album var. lactewm Mass. Sched. Crit. (1855) 
p. 183. 
A good variety characterized by the colour of the thallus and of the 
apothecia. Massalongo, /. c., describes the latter as scattered; but, in the 
specimens seen, they are here and there congregate. It is a very doubtful 
