278 LICHENACEL. [PELTIDEA. 
1. P. aphthosa Ach. Lich. Univ. (1810) p. 516.—Thallus broadly 
membranaceous, thin or moderate, smooth, somewhat shining, bearing 
cephalodia, bright grass-green when moist, glaucous-green or lurid- 
glaucous when dry; beneath either reticulately blackish-nervose or 
almost continuously brownish-black, with broad whitish margin ; the 
thizine long, blackish. Apothecia rotundate, moderate or large, 
ascending, reddish-brown, the margin inflexed and lacerate ; spores 
8ne, fusiform, 3-7-septate, colourless or pale-brown, 0,060-92 mm. 
long, 0,005-6 mm. thick.—Gray, Nat. Arr.i. p. 428 ; Hook. Fl. Scot. 
ii. p. 60; Sm. Eng. FL. v. p. 215; Tayl. in Mack. Fl. Hib. ii. p. 153; 
Cromb. Lich. Brit. p. 28.—Peltigera aphthosa Mudd, Man. p. 81; 
Leight. Lich. Fl. p. 107, ed. 3, p. 101. Lichen aphthosus Linn. Fl. 
Suec. (1755) p. 1098; Lightf. Fl. Scot. ii. p. 847; Huds. Fl. Angl. 
ed. 2, p. 547; With. Arr. ed. 3, iv. p. 70; Eng. Bot. t. 1119. 
Lichenordes digitatum lete-virens, verrucis nigris notatum Dill. Muse. 
199, t. 27. f. 106.—Some of the above include no doubt also the 
following variety.— Brit. Evs.: Leight. n. 321; Cromb. n. 147. 
The epigenous cephalodia distinguish this from other species of the 
tribe. They are patelliform or verrucoso-unequal, pale, either superticial 
or slightly impressed, usually numerous and sprinkled over the whole 
one surface of the thallus. The underside is sometimes continuously 
blackish, with confluent nerves (form verrucosa Web.); but this seems 
to be an accidental state resulting from the nature of the substratum. In 
i country it is rarely seen in fruit; the old apothecia become rather 
arge. 
Hab. Among mosses on rocks and boulders, as also on turf walls in 
moist shady upland districts.— Distr. Local and scarce in W. and N. Eng- 
land and S. Scotland; more plentiful in the Grampians, Scotland, where 
it fruits more freely ; rare in N. Ireland.—B. M., Stouts’ Wood, Glou- 
cestershire ; near Buxton, Derbyshire; Craigforda, Herefordshire; Llyn 
Bodlyn, Merionethshire ; Llanberris, Carnarvonshire ; Teesdale, Durham ; 
near Kendal, Westmoreland; Walla Crag, Cumberland; The Cheviots, 
Northumberland. Falls of the Clyde, Lanarkshire; near Inverary and 
Barcaldine, Argyleshire ; Glen Lochay, Killin, Blair Athole, Den of 
Rechip, Perthshire ; Sidlaw Hills, Forfarshire ; Craig Cluny, Invercauld, 
and Craig Coinnoch, Braemar, Aberdeenshire; Loch Linnhe, Lochaber, 
Inverness-shire. Near Belfast, co. Antrim ; Connemara, co. Galway. 
Var. 3. leucophlebia Not. Sillsk. F. et Fl. Fenn. Férh. n. s. v. 
(1866) p. 117.—Thallus less dilated, paler, more opaque; beneath 
entirely whitish ; the nerves distinct, whitish or pale. Apothecia 
rare; spores 3-septate, 0,052-0,066 mm. long, 0,004-6 mm. thick. 
—Peltigera aphthosa, var. leucophlebia Nyl. Syn. i. (1860) p. 323. 
— Brit. Hxs.: Mudd, n. 58. 
Differs in the usually smaller thallus, the colour of its upper and under 
surfaces, and in the pauci-septate spores. Nylander (Syn. 4. ¢.) observes 
that it had somewhat the habit of Peltigera rufescens (this, however, is 
less marked in our British specimens), but with the peculiar cephalodia 
of this species. In this country it is always sterile. 
Hab. Among’ mosses on shady rocks in upland districts.—Distr. Local 
and. rare in S.W, and N, England, in S. Scotland, and the 8. and W. 
