220 PKOCEEDINGS OF THE AMERICAN ACADEMY 



11. P. terehrata, Mart. Th. somewhat inflated, suborbicular, green- 

 ish-glaucescent; plicate-rugose and black on the underside; lacinise 

 radiant, approximate, plane-appressed, sublinear (often sorediiferous), 

 with small, regular, rounded perforations; apoth. scattered, plane, red, 

 margin very entire. Mart. Fl. Crypt. Erlang. P. diatrypa, Ach. Syn. 

 p. 219. Tuckerm. Lich. N. E. I. c. 



Trunks in mountain forests, frequent, and rocks, fertile ; New Eng- 

 land. 



12. P. physodes., Ach. Th. somewhat inflated, suborbicular, glau- 

 cous-white ; black-fuscous and naked on the under side ; lacinise loose- 

 ly imbricate, linear, sinuate-multifid, somewhat convex ; apoth. elevated, 

 reddish-fuscous, with an inflexed, entire margin, at length explanate. 

 Ach. Syn. p. 218. — /3. enter omorpha, Tuckerm. ; lacinise effuse, lax, 

 somewhat elongated, ventricose-inflated ; apoth. subpedicellate, ventri- 

 cose-cyathiform, at length explanate, very entire. P. enter omorpha., 

 Ach. ! Syn. p. 219. P. platycarpa, Tuckerm. Lich. N. E. I. c. 



Trunks, dead wood, and rocks, fertile ; New England. New York, 

 Torrey. Pennsylvania, Muhl. North to Arctic America, Rich. — /?, 

 firs and other trees in high mountain forests. Northwest Coast, Men- 

 zies ! Douglas in herb. Hook. ! Mountains of New England, fertile, 

 and evidently passing into a. 



13. P. colpodes, Ach. Th. somewhat inflated, suborbicular, green- 

 ish-glaucescent ; black and spongy on the under side ; lacinise some- 

 what plane, at the circumference ramose-multifid, with irregularly den- 

 tate margins; apoth. elevated, chestnut, margin inflexed, entire. Swartz 

 Lich. Amer. p. 4, & i. 3. Ach. ! Syn. p. 219. 



Trunks. Near Boston, Sioartz ^the original station of the Lichen). 

 Throughout New England, common and fertile. New York, Halsey. 

 Pennsylvania, Muhl. 



Series 2. Olivaceo -fu s c cb, Fr. 



14. P. olivacea, Ach. Th. membranaceous, orbicular, smooth, ru- 

 gulose (elevated-punctate, or granulate-farinose), olivaceous-fuscous ; 

 paler and subfibrillose on the under side ; lobes radiant, appressed, 

 plane, rounded, crenate ; apoth. dark-olive, with an inflexed, at length 

 crenate margin. Fr. Lichenogr. p. 66. 



Trees in mountainous districts, fertile ; also degenerant on dead wood 

 and stones; New England. New York, Torrey. Pennsylvania, Muhl. I 

 Northward to Arctic America, Rich. 



