278 L1CHENACEI. [PELTIDEJ 



1. P. aphthosa Ach. Lich. Univ. (1810) p. 516. Thallus broadl 

 membranaceous, thin or moderate, smooth, somewhat shining, bearin 

 cephalodia, bright grass-green when moist, glaucous-green or lurid 

 glaucous when dry : beneath either reticulately blackish-nervose o 

 almost continuously brownish-black, with broad whitish margin ; th 

 rhizinae long, blackish. Apothecia rotundate, moderate or large 

 ascending, reddish-brown, the margin inflexed and lacerate ; spore 

 8nse, 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. Scol 

 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 aphthosm Linn. F] 

 Suec. (1755) p. 1098 ; Lightf. Fl. Scot. ii. p. 847 ; Huds. Fl. Ang] 

 ed. 2, p. 547; With. Arr. ed. 3, iv. p. 70; Eng. Bot. t. 1119 

 Lichenoides digitatum la>te-virens, verrucis nigris notatum Dill. Muse 

 199, t. 27. f. 106. Some of the above include no doubt also th 

 following variety. Brit. Exs. : Leight. n. 321 ; Cromb. n. 147. 



The epigenous cephalodia distinguish this from other species of th 

 tribe. They are patelliform or verrucoso-unequal, pale, either superticia 

 or slightly impressed, usually numerous and sprinkled over the whol 

 upper surface of the thallus. The underside is sometimes continuous! 

 blackish, with confluent nerves (form verrucosa Web.) ; but this seeni 

 to be an accidental state resulting from the nature of the substratum. I: 

 this country it is rarely seen in fruit ; the old apothecia become rathe 

 large. 



Hob. Among mosses on rocks and boulders, as also on turf walls i 

 moist shady upland districts. Distr. Local and scarce in W. and N. Eng 

 land and S. Scotland ; more plentiful in the Grampians, Scotland, wher 

 it fruits more freely ; rare in N. Ireland. B. M. , Stouts' Wood, Glou 

 cestershire ; near Button, Derbyshire ; Craigforda, Herefordshire ; Llyi 

 Bodlyn, Merionethshire ; Llanberris, Carnarvonshire ; Teesdale, Durham 

 near Kendal, Westmoreland ; Walla Crag, Cumberland ; The Cheviots 

 Northumberland. Falls of the Clyde, Lanarkshire; near Inverary am 

 Barcaldine, Argyleshire ; Glen Lochay, Killin, Blair Athole, Den o 

 Rechip, Perthshire ; Sidlaw Hills, Forfarshire ; Craig Cluny, Invercauld 

 and Craig Coinnoch, Braemar, Aberdeenshire ; Loch Linnhe, Lochabe) 

 Inverness-shire. Near Belfast, co. Antrim ; Connemara, co. Galway. 



Var. ft. leucophlebia Not. Sallsk. F. et Fl. Fenn. Forh. n. s. v 

 (1866) p. 117. Thallus less dilated, paler, more opaque; beneatl 

 entirely whitish ; the nerves distinct, whitish or pale. Apotheci; 

 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. Exs. : Mudd, n. 58. 



Differs in the usually smaller thallus, the colour of its upper and unde 

 surface?, and in the paiici-septate spores. Nylander (Syn. /. c.) observe 

 that it had somewhat the habit of Peltigera rufescens (this, however, i 

 less marked in our British specimens), but with the peculiar cephalodi; 

 of this species. In this country it is always sterile. 



Halt. Among mosses on shady rocks in upland districts. Distr. Loca 

 and rare in S.W. and N. England, in S. Scotland, and the S. and W 



