276 PROCEEDINGS OF THE AMERICAN ACADEMY 



inflexed, the under side white at the edges. E. viride, Ach. Verruca- 

 ria Icztevirens, Borr. in E. Bot. Suppl. t. 2658. 



Oq the earth in alpine districts. White Mountains. Arctic Ameri- 

 ca, Rich. The apothecia are unknown, and the plant is a very doubt- 

 ful member of the present genus. Fries regards it a metamorphosis 

 of the squamules of Cladonia. 



XXV. SAGEDIA, Ach., Fr. 



Apothecia included in the thallus, globose ; nucleus gelatinous, de- 

 liquescent, and, as well as the membranaceous, thin exciple, becoming 

 at length blackish ; ostioles discrete, attenuated into a thin neck, and 

 dilated at the apices, pertuse. Thallus horizontal, subcrustaceous. 



S. cinerea, Fr. Crust cinereous, at length pruinose, somewhat foli- 

 aceous at the circumference ; on the under side spongy, black ; osti- 

 oles superficial, spheroidal. Fr. Lichenogr. p. 413. Endocarpon, Pers. 

 E. tephroides, « Sf ^3, Ach. Syn. 



(On the earth. Fr.) New York (rocks), i/a/sey. We have perhaps 

 a Sagedia, on rocks, in New England. 



XXVI. PERTUSARIA, DC. 



Apothecia verrucseform, formed from the thallus, including (1 — 00) 

 naked, waxy-gelatinous, colored nuclei. Thallus crustaceous, often 

 passing into soredia and isidia. 



1. P. pertusa, Ach. (sub Porina). Crust cartilagineous, glaucous- 

 white; apothecia depressed-hemispherical, irregular; ostioles depressed, 

 discrete, the perfect ones black-papillate. Fr. Lichenogr. p. 420. Po' 

 rina pertusa, Ach. Lichen pertusus, L. Pertusaria communis, DC. 

 — * sorediifera ; crust sterile, sorediiferous. Fr. I. c. Variolaria sp. 

 Ach. — ** coccodes ; crust isidioid, papillose-ramulose. Fr. I. c. Isi- 

 diiim coccodes, Ach. — /5. areolata, Fr. ; crust thicker, rimose-areolate, 

 verrucose, often sterile and sorediiferous. Fr. I. c. Variolaria Flo- 

 fowiana, Floerk. ! — /. leucostoma, Fr. ; apothecia with white ostioles, 

 the black papillae deficient. Fr. I. c. Porina leucostoma, Ach. — 

 8. leioplaca, Fr. ; crust very smooth ; apothecia imperfect, chinky-de- 

 hiscent. Fr. I. c. Porina leioplaca, Ach. 



Trunks and dead wood; — ,?, stones ; New England. New York 

 (<», /, and 8), Halsey. Pennsylvania (« and 8), Muhl. 



