PELTIGERA. 109 



Ach., as understood by lichenists, has probably often included 

 small forms of Peltigera rufescens, and was referred to the latter 

 in Syu. N. Eng. ; as later by Nylander. 



9. P. canina (L.) Hoffm. ; thallus ample to large, membra- 

 naceous, round-lobed, flaccid, furrowed, downy; greenish-grey 

 (ciuerascent, and brownish) ; beneath whitish, with veins and 

 fibrils of much the same colour, or now darkening ; the fertile 

 lobules somewhat elongated ; apothecia middling to ample, 

 rounded, becoming semi-revolute and vertical ; disk reddish- 

 brown. Spores acicular, 4-8-locular, ^^ mic. Fr. L. E. p. 45. 



b. spongiosa, Tuckerm. ; thallus sub-coriaceous ; the pale 

 veins of the under side passing into tufted fibrils of the same 

 colour which finally run together into a dense, continuous, spongy 

 na p. Lich. exs. n. 103. Gen. p. 38. 



c. membranacea, Ach. Nyl. ; thallus very thin and scrobicu- 



late, almost smooth above. Ach. L. U. p. 517. Nyl. Syn. 1, 



p. 324. 



ft, spuria, Ach. ; thallus much reduced, sub-coriaceous ; the 

 cream-coloured veins of the under side scarcely fibrillose, the 

 fertile lobules somewhat digitately clustered ; apothecia small- 

 ish. Ach. L. U. p. 518. P.pusilla, Koerb. Syst. p. 59. 



b. sorediata, Schser. ; thallus as in but mostly sterile and 

 round-lobed ; besprinkled with grey soredia; the under side now 



more fibrillose. Sclicer. Enum. p. 21. P. erumpens, Tayl. 



Neiv Lich. 1. c. p. 184, & herb. P. leptoderma, Nyl. Syn. I, p. 324, 

 & in Lindig Herb. N. Gran. n. 2559. P. canina, v. sorediifera, 

 Tuckerm. Gen. p. 38. 



On the earth, rocks, and mossy trunks. Pennsylvania, Muh- 

 lenberg Catal. 1818, and throughout the northern, middle, and 

 western States. Canada, Agassiz. Arctic America, Richardson 

 (fide Leightou, 1. c.}. Mountains of the southern States, Ravenel. 

 New Mexico, Fendler. Pacific coast, Douglas ; Bolander, etc. 



&, spongiosa, sub-alpine regions of the White Mountains, 



Tuckerman. British Columbia, Macoun. One of the largest 



and most marked conditions of the species. c, membranacea, 



NorthWest coast, Douglas. Oregon, E. Hall. California, Bo- 

 lander. Mexico, Nylander. ft. spuria has probably the same 



range as a, but I can only cite it from New Jersey (old fields), 

 Austin; low country of South Carolina (on banks), Eavenel ; 

 California, Bolander ; and British Columbia, Macoun. b, sore- 



