Pr.LTlGEEA.] PELTIGEREr. 293 



Brit. p. 29, Peltlijera canina c. scutata Mudd, Man. p. 83. Peltulea 

 sciitata Gray, Xat. Arr. i. p. 427 ; Hook. Fl. Scot. ii. p. 60 ; Sm. 

 En*. Fl. V. p. 215. Lichen scutdus Dcks. Crypt, fasc. iii. (1793) 

 p. IS ; With. Arr. ed. 3, iv. p. 71 ; Eng. Bot. t. 1834. Lichenoides 

 suhfuscum, 2^eUis horizontal ibi(s planis DiU. Muse. 205, t. 27. 

 f. 1U4 c. — Brit. E.VS. : Leight. n. 2G2 pro parte; Cromb. n. 44. 



Well characterized by the siuuato-lobed thallu?, minutely granulate 

 above, and by the cii.<p and usually sorediate, though sometimes naked, 

 margins ; otherwise it is closely allied to P. polydactyla. The apothecia, 

 which are rare, are aduate on very short lobes, and become dark-brown 

 or blackish in dried plants. 



Ilah. Among mosses on the trunks of trees, rarely on turf walls, in 

 wooded upland districts. — Distr. Local and scarce in the mountainous 

 tracts of W. and X. England, S. and X. \\'ales, S. and Central Scotland ; 

 apparently rare in X'.E. and S.W. Ireland. — 13. M. : Shanklin, Isle of 

 AVight ; Elburton, Kingsbridge, South Brent, and near Harberton, Devon- 

 sliii'e ; Tregawn and Withiel, Cornwall ; near Oswestry, Shropshire ; 

 near Edwinsford, Carmarthenshire ; llafod, Cardiganshire ; Dolgelly and 

 Llyn Bodlyn, Merionethshire ; Iloggait's Wood, Cleveland, Yorkshire ; 

 -Vmbleside, Westmoreland. Xew Calloway, Kirkcudbrightshire ; Col- 

 linton Woods, near Edinburgh ; Inverary and Barcaldine, Argyleshire ; 

 The Trossachs and Glen Lochay, Perthshire ; S. of Fort William, Inver- 

 ness-shire ; Glenferness, Xairusbire. Xear Belfast, co. Antrim ; Killarney, 

 CO. Kerry. 



8. P. horizontaHs Hoffm. Deutsch. Fl. ii. (1795) p. 107.— Thallus 

 expanded, rotuudato-lobed, smooth or obsoletely impresso-unequal, 

 somewhat shining, sinuato-crenate and slightly undulate at the 

 margins, dull- or brownish-green when moist, pale-glaucous or pale- 

 brown when dry ; beneath white and reticulate with black or 

 brownish-black subvillose nerves, which are pale at the circum- 

 ference : rhizinae few, scattered, blackish-brown. Apothecia large, 

 orbicular or elliptical, transverse, plane, reddish- or blackish-brown, 

 the margin subcrenulate ; spores 6-8n?e, fusiform, 3-septato, 

 0,030— 12" mm. long, 0,006-7 mm. thick. — Mudd, Man. p. 84; 

 Cromb. Lich. Brit. p. 29 ; Leight. Lich. Fl. p. 110, ed. 3, p. 104.— 

 Pehidea horizontal is Gray, Xat. Arr. i. p. 427 : Hook. Fl. Scot. ii. 

 p. 60; Sm. Eng. Fl. v. p.'215; Tayl. in Mack. Fl. Hib ii. p. 153. 

 Lichen horizoiitulis Linn. Mant. (1771) p. 132; Huds. Fl. Angl. 

 p. 543 ; Lightf. Fl. Scot. ii. p. 849 ; With. Arr. ed. 3, iv. p. 72 ; 

 Eng. Bot. t. 888. Lichenoides suhfuscum, peltis horizontalihus planis 

 Dill. Muse. 205, t. 28. f. 104 i, B.—Brit. Exs. : Leight. n. 108 ; 

 Mudd, n. 02; Cromb. n. 45 ; Larb. Lich. Hb.n. 249 ; Bohl. n. 37. 



The thallus sometimes spreads very extensively, and, except in its 

 larger size, is similar to that of P. ru/escens. From this as well as from 

 the other species of the genus, the horizontal apothecia and the deter- 

 minately 3-septate spores render it very distinct. The apothecia are 

 usually very numerous, and occasionally become somewhat large. 



Jfab. On shady rocks and the mossy stimips of felled trees in upland 

 districts. — Distr. General though not very common in the mountainous 

 tracts of Great Britain, and probably of Ireland ; most frequent on the 



