282 PJIOCEEDINGS OF THE AMERICAN ACADEMY 



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

 Hook. Br. Fl. 2, p. 209. Schcer. Spicilf2, p. 543 {sub 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 /3 of Acharius, but 

 were not considered to differ from « 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. Bat. 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 leucoderma^ Willd. herb. ? 



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

 very distinct from the last. Penn. (P. leucoderma, 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. 

 scattered, sessile, blackish-fuscous, margin entire. Hook. Br. Fl. p. 2, 

 211. Lichen granulatus, Huds. (e Hook.). Collema furvum, Ach. 

 Exs. Schcsr. ! Lich. Helv. 413, 414. Icon, E. Bot. t. 1757. 



Stones and trunks. New England. New York, Halsey. Pennsyl- 

 vania .•' Muhl. 



** Thallus thin, foliaceous, gelatinous-membranaceous, lobed princi- 

 pally at the circumference. 



7. C. melcenum, Ach. Th. foliaceous, somewhat stellate, blackish- 



