90 COLLEMACEa: OP THE NORTHERN STATES 



Spicil. 2, p. 538 {sub Parmelia). C. crislalum, Borr. in Hook. Br. Fl. 

 2, p. 208. Icon, Wulf. in Jacq. Coll. 3, p. 139, t. 12, /. 1. 



Upon rocks, among mosses. Pennsylvania, Muhl. I have not ob- 

 served this species in the granite region of New England. 



2. C. plicaiile, Ach. Th. thick, orbicular, black-green ; lobes ru- 

 gose-plicate, ascending, laciniate ; apoth. concave, of nearly the same 

 color with the thallus, with a thick, elevated margin. Ach. Syn. p. 314. 

 Hook. Br. Fl. 2, p. 209. Schar. Spicil. 2, p. 543 {stib Parmelia). 

 Exs. Schleich. ! Lich. Helv. 



Eocks (limestone, Schser.), New York, Russell ! I have seen only a 

 small fragment, but it appears to belong to this rather than to the pre- 

 ceding species. 



3. C. tenax, Ach. Th. rather thick, suborbicular, glaucous-green, 

 of somewhat plane, rounded, cut, or crenate lobes ; apoth. scattered, at 

 first urceolate, becoming rather elevated, concave, rufescent, with a 

 somewhat entire margin. Ach. Syn. p. 314. — (?. pallescens, Ach.; 

 th. yellow-virescent, pale beneath, the lobes irregular, densely compli- 

 cated, irregularly crenate, ascending ; apoth. submarginal. Ach. I. c. 



Rocks among mosses, Pennsylvania, Muhl. ! New York, Spreng.! 

 The cited specimens belong probably to the variety (S of Acharius, but 

 were not considered to differ from a by Floerke. 



4. C. fasciculare, Ach. Th. suborbicular, imbricate-plicate, olive- 

 green, the lobes dilated upward, waved, those of the circumference 

 rounded, cut-crenate ; apoth. marginal, at length elevated-subpedicel- 

 late, fasciculate, the disk somewhat convex, rufous. Ach. Syn. p. 317. 

 Fr.! Lich. Suec. 50. Icon, E. Bot. t. 1162. 



Trunks and rocks, New England. Pennsylvania, Muhl. 



5. C. pustulatum, Ach. Th. substellate, lacerate-laciniate, the la- 

 cinise expanded, plane, irregularly crenate, besprinkled above with paler 

 pustules which pass at length into apothecia ; disk punctiform, black. 

 Ach. Syn. p. 351. Parmelia leucoderrna, Willd. herb. 7 



Upon mosses. North America, Ach., who says it is a minute species, 

 very distinct from the last. Pennsylvania (P. leucoderrna, Willd.), 

 Muhl. ! 



6. C. granulatum, Hook. Th. foliaceous, membranaceous, corru- 

 gated, granulated on both sides, imbricate-complicate, blackish-olive, 

 the lobes somewhat rounded, waved and crisped, rather entire ; apoth. 



