711 



herbaceous stems, in Carolina, on Eupatorium purpureum, Pennsyl- 

 vania and New Jersey; probably common throughout the United 

 States. 



Leptostroma vulgare, Fr., is considered to be the spermogonial 

 form of this species; sporules elongated, subobtuse, slightly curved, 

 continuous, 7 x 1 j 2 /i. The diagnoses of this and of H. mrgultorum 

 are almost identical, and whether the two are really distinct may well 

 be doubted. H. commune seems to differ only in its more obtuse, 

 rather smaller perithecia with less open lips. If the two are really 

 distinct, the difference is to be sought in the spermogonia. Hysterium 

 confluens, Schw. Syn. N. Am. 2101, and H. expallens, Schw. 1. c. 2106, 

 are apparently only forms of Hypoderma commune, but the specc. in 

 Herb. Schw. are entirely sterile. 



H. virgultorum, DC. Flore Franc. VI, p. 165. 



Hysterium Rubi, Pers. Obs. Myc. I, p. 84. 

 Exsicc. Fckl. F. Rh. 757. Kunze F. Sel. 162. M. & N. Stirp. Vog. 564. Rehm Asc. 362, 

 919. Sydow, M. March. 329. Thum. M. U. 180. Rav. F. Am. 324. Roura. F. G. 

 270. EH. & Evrht. N. A. F. 2d Ser. 2378. 



Perithecia scattered, subinnate, lying parallel in the direction of 

 the axis of the stem, elongated, acute, smooth, shining, black, at length 

 gaping, gray inside. Asci clavate-oblong, long-stipitate, 8-spored. 

 90x9 /*, with filiform paraphyses hooked or spirally coiled above. 

 Sporidia fusoid-elongated, subobtuse, straight or slightly curved, 

 2-celled, 2-nucleate, hyaline, 21-24 x 3-4 (i\ polystichous. The sper- 

 mogonial stage is Leptostroma mrgultorum, Sacc, with 1 -celled, sub- 

 cylindrical sporules 4-5 x 1 p.. 



On dead stems of Rubus, New Jersey and Carolina, on bramble. 

 California (Harkness). 



H. ilicinum, De Not. Giorn. Bot. Ital. II, p. 35, Duby, Hyst. p. 40. 



Exsicc. EH. N. A. F. iooo. 



Innate, epiphyllous, scattered, elliptical, obtuse at the ends, at 

 length deciduous, dark gray as seen through the epidermis, 700 x 

 350 p\ lips slightly swollen, white-margined, at first closed, at length 

 partially open, exposing the pallid disk. Asci clavate-stipitate, 80 x 

 12 p, p. sp. about 50x12 p, paraphysate, 8-spored. Sporidia oblong 

 or clavate-cylindrical, slightly curved, hyaline, about 15-20x3-4^. 

 continuous, indistinctly nucleate, at length faintly uniseptate. 



On leaves of Quercus virens, Hibernia, Florida (Dr. Martin), on 

 leaves of some species of oak, in Mexico (Dr. Eckfeldt). 



The measurements of asci and sporidia are from the Florida 

 specimens. 



