462 LICHENACET. [Lecanora. 
Form 1. crenularia Cromb. Grevillea, xviii. (1890) p. 70.— 
Thallus as in the type. Apothecia with the thalline margin rugoso- 
crenulate. 
Differs merely in the coarsely crenulate thalline margin of the apothecia, 
which, however, is occasionally less distinctly visible in their juvenile 
state, so that it is scarcely a variety. 
Hab. On rocks and trunks of old trees in maritime and upland 
situations.— Distr, Only a very few localities in Great Britain and 
Treland.—B. M.: New Forest, Hants; Hale’s End, Malvern, Worcester- 
shire; Wansheck Valley, Northumberland. Island of Lismore, Argyle- 
shire. Brandon mt., co. Kerry. 
Form 2. nivea Cromb.—Thallus and the thalline margin of the 
apothecia soft, snowy-white; otherwise as in the type. 
Apparently a well-marked form, which, if the characters given are 
constant, would be a good variety. In the two small British specimens 
the thallus is verrucoso-rugose and the apothecia concave with thick 
thalline margin. 
Hab. On the trunk of an old tree in an upland situation. Distr. Seen 
only very sparingly from W. Ireland.—B. M.: Killaloe, co. Clare. 
Var. 3. Turneri Nyl. Mém. Soc. Cherb. v. (1857) p. 113.— 
Thallus more or less leproso-dissolved, whitish or greenish-white. 
Apothecia submoderate, white-pruinose ; the thalline margin thick, 
entire, white-pulverulent.—Cromb. Lich. Brit. p.54; forma Purneri 
Leight. Lich. Fl. p. 190, ed. 3, p. 2038.—L. pallescens y. Lurneri 
Mudd, Man. p. 155. Rinodina Turnert Gray, Nat. Arr. i. p. 454. 
Lecanora Turnert Sm. Eng. Fl.v. p.191. Lichen Turnert Eng. Bot. 
t. 857.—Brit. Exs.: Mudd, n. 127; Leight. n. 237. 
A good variety characterized by the white-sorediate thallus and the 
pulverulent margin of the apothecia. These are usually rather scattered, 
with the thalline margin rarely subcrenulate (form suberenata Cromb. 
Grevillea, xviii. p. 70). 
Hab. On trunks of old trees in maritime and upland wooded regions. 
—Distr. Here and there throughout England; rare in N. Wales, the 
8.W. Highlands and N. Grampians, Scotland, as also in S. Ireland.— 
B.M.: Epping Forest, Essex; The Holmwood, Surrey; Hurstpierpoint, 
Sussex; Carrisbrook and Bembridge, Isle of Wight New Forest, 
Hampshire; Gillingham, Dorsetshire; Ugbrook Park, Chudleigh, S. 
Devon; Savernake Forest, Wiltshire; near Barmouth, Merionethshire ; 
near Ayton, Cleveland, Yorkshire; Egleston, Durham. By Loch Creran, 
Barcaldine, Argyleshire; Morrone, Braemar, Aberdeenshire. Old Deer 
Park, Castlemartyr, co. Cork; Muckruss, Killarney, co. Kerry, 
156. L. pallescens Nyl. Bull. Soc. Linn. Normand. sér. 2, t. ii, 
(1868) p. 68.—Thallus determinate, thinnish, granulato-unequal, 
whitish or greyish-white (K—,CaCl—); hypothallus white, limiting 
the thallus. Apothecia submoderate, concave or somewhat planc, 
