PELTIGERA. 107 



4. P. polydactyla (Neck.) Hoffm. ; thallus ample, for the most 

 part thin, and very smooth and bright; from greenish-glauces- 

 cent becoming lead-coloured, or now brown ; beneath somewhat 

 naked, conspicuously reticulated with brown veins ; the rather 

 elongated fertile lobes digitately clustered ; the middling-sized 

 apothecia finally revolute; disk reddish-brown. Spores acicu- 



lar ; slender, 4-8-locular, ^ mic. Ach. Syn. p. 240. Tuck- 



erm. Lich. exs. n. 10. 



Rocks, and trunks, among mosses. Pennsylvania, Muhlen- 

 berg Catal 1818. New York, Halsey. New England, Tucker- 

 man. Ohio, Drege, etc. Low country of the southern States 

 from South Carolina, Ravenel, to Louisiana, Hale. Rocky Moun- 

 tains, J". Wolf. Pacific Coast, Douglas, etc. Mexico (f. dolicho- 

 rhiza, Nyl.), Nylander. 



5. P. scutata (Dicks.) Leight; thallus smallish, thin and 

 paper-like, or now thicker as in the last, dull, and at length 

 somewhat roughened ; greenish-ash-coloured and rufescent; the 

 narrowed, crisped lobes more or less grey-sorediate at the mar- 

 gins, the fertile ones very short and scattered ; beneath white 

 and reticulated with brown veins ; apothecia smallish, rounded, 

 or transversely oblong; disk blackish-brown. Spores acicular, 



4-8-locular, ^ mic. Peltidea, Ach. Syn. p. 237. Hook. Br. 



Fl. 2, p. 215. Peltigera, Leight. Lich.-Fl. Brit. p. 210. P. Urn- 

 bata, Delis, herb., Hepp. Nyl. in Norrl. Lich. Fenn. 



On the earth, rocks, and trees, among mosses. Pennsylva- 

 nia, Muhlenberg Catal. 1818. White Mountains, Tuckerman. 

 Ohio, Drege, Lesquereux, etc. British Columbia, Dr. Lyall. 



Oregon, Hall. California, Bolander. Differs both from the 



last and the next following species, and may properly take a 

 place by itself. There is no doubt of the legitimateness of the 

 long-received name, which can hardly yield now toDelise's man- 

 uscript one. 



6. P.pulverulenta (Tayl.) Nyl. ; thallus middling-sized, cor- 

 iaceous, more or less furrowed and pitted, opake, rimulose-gran- 

 ulate; from greenish-glaucescent becoming ash-coloured and 

 lurid brown; beneath white with brown at length confluent 

 veins ; the short fertile lobes digitately clustered ; apothecia 

 middling-sized; orbicular, disk dark-brown. Spores acicular, 



4-8-locular, ^ mic. Peltidea, Tayl. New Lich. in. Hook. 



Lond. Journ. Bot. 1847,^?. 184. P. rufescens, var., Nyl. Syn. 1, 



