676 



dsTROPA, Pr. 



Sumraa Veg. Scand. p. 401. ' 



Perithecia imtuersod, orbicular, of a corky, horn-like texture, firm, 

 with a prominent papilla, rather large, with a longitudinal dehiscence 

 and swollen lips. Asci cylindrical. Sporidia lying parallel, closely 

 packed, typically filiform, multiseptate or multiguttulate, hyaline. 

 Paraphyses slender. 



Placed by Dr. Rehm among the Discomycetes, (Die Pilze III, 

 p. 185). 



0. cinerea, (Pers.) 



Hysterium cinereum, Pers. Syn. p. 99. 

 Sphezria dardara, Fr. S. M. II, p. 468. 

 Bxsicc. Moug. & Nest, g56.— Desm. PI. Crypt. Ed. I, 621. 



Perithecia scattered, the base immersed in the wood or, more 

 rarely, in the bark, finally emergent, gray-cinereous, finally shining- 

 black, rather large, with a prominent papilla, depressed-sphteroid, 

 opening with an elongated fissure extending nearly across. Asci 

 cylindrical or filiform, 180-200x7-10 //, thickened at the apex, 

 8-spored. Sporidia filiform, 180 x 1^ ^, multiseptate, hyaline or yel- 

 lowish-hyaline. Paraphyses very slender, branching, evanescent. 



Fries, in S. M. II, p. 468, doubtfully refers to this, species, speci- 

 mens on wood of Ziiquidambar from Carolina. 



About as large as a hemp seed. The conical or papilliform 

 ostiolum is rarely seen, the perithecium being generally split across 

 the top like a Hysterium. 



0. sphffirioides, Schw. Syn. N. Am. 1829. 



Perithecia scattered or aggregated, but not confluent, rather large, 

 orbicular-elliptical, erumpent, subcompressed, black, subrugose, open- 

 ing with a short transverse cleft, almost like the ostiokm of Tremato- 

 sphoiria pertusa. 



On a piece of dry wood. New England (Torrey). 



0. rn^ulosa, Schw. 1. c. 1830. 



Perithecia arranged in long, effused, confluent groups, the single 

 perithecia scarcely distinct, carbonaceous, very black outside, brown, 

 inside, striate-rimose, innate in the cinereous colored wood which is 

 raised into a tubercle, at length subdehiscent. The surface of the 

 perithecia is generally flattened and rugulose. 



On decorticated spots on a decaying log of Juglans cinerea, Erie 

 Co., Pa. (Schw.). 



