280 PROCEEDINGS OF THE AMERICAN ACADEMY 



white-hoary ; perith. hemispherical, dimidiate (not immersed at the 

 base), persistent ; nucleus whitish. Fr. Lichenogr. p. 444. 

 Trunks. New England. New York, Halsey. 



8. V. epidermidis, Fr. Cr. innate in the matrix or obsolete ; perith. 

 dimidiate, the base patent, innate-superficial, at length collapsing, and, 

 together with the nucleus, applanate-depressed. Fr. Lichenogr. p. 447. 

 — a ; perith. larger, orbiculate. Fr. I. c. V. analepta, Ach. — /S ; pe- 

 rith. larger, elliptical. Fr. I. c. V. Cerasi ^ epidermidis, Ach. — 

 y; perith. small, punctiform (with the habit of the next species). Fr. 

 I. c. V. stigmatella, Ach. part. 



Trunks, mostly on smooth bark ; New England, and westward. 

 New York (« and /?), Halsey. Arctic America, Rich. 



9. V. punctifor7nis, Pers. Cr. innate in the matrix or obsolete ; pe- 

 rith. innate-superficial, semiglobose, subdimidiate, the base inflexed ; 

 nucleus globose. Fr. Lichenogr. p. 447. V. stigmatella, Ach. part. 



Trunks on smooth bark ; New England. New York, Torrey. Penn- 

 sylvania, Muhl. Arctic America, Rich. 



10. V. pulla, Ach. Cr. smoothish, blackish-fuscous ; perith. minute, 

 hemispherical, glabrous, subpapillate, black within. Ach. Syn. p. 88. 



Bark of Dirca palustris, Ach.., who compares it with V. carpinea, 

 which is referred to the last species by Fries. 



Tribe IV. LIMBORIACE^, Fr. 



XXIX. PYRENOTHEA, Fr. 



Perithecia round, carbonaceous, closed, pertuse at length with a sim- 

 ple ostiole, and protruding the somewhat gelatinous, bursting nucleus, 

 finally dehiscent, explanate, and empty. (A disciferous state occurs in 

 a single species.) Thallus crustaceous. 



P. leucocephala, Fr. Crust smooth, glaucescent ; perithecia subglo- 

 bose, naked, black, coronate with the white, persistent, globuliform nu- 

 cleus. Fr. Lichenogr. p. 450. — /5. Lecidina, Fr. ; crust somewhat 

 leprous ; disk dilated-scutelliform, rigescent, covered for the most part 

 with a dense pale-yellowish-cinereous bloom. Fr. I. c. Lecidea ahie- 

 tina, Ach. 



Trunks (/5), Arctic America, Rich. 



