758 PHACIDIACEI. 



Nees.f. 302. Movg. exs. no, 26G. Grev. 1. 167, f. 1. Eng. Fl. y.p. 

 293. Corda. v./. CI. Desm. exs. no. 779. FcJd. exs. no. 749. 



On trunks of trees. Common. [United States.] 



Tlie sporidia are at first uniseptate and hyaline, but ultimately become 

 triseptate and brown. Sporidia COOOru-'OOOy in.) •018--022 m.m. 



2284. Hysteriuxn angustatuxn. A. Jy S. "Narrow 



Hysteriuni," 



Superficial, elongated, linear, nearly smooth, black, opaque ; 

 asci cvlindrico-clavate ; sporidia oblong, triseptate, brown. — A. 

 ^ S. Consp. no. 158. Rahh. exs. no. 720. 



On twigs, bark, wood, &c. 



This species is evi 'ently as common as H. puHcare, from wWcb the sporidia 

 differ in being considerably smaller ("' :004-"000o in.) ■01-"0125 m,m., with 

 the terminal joints coloured. The sporidia in J£. pulicare are '00025 in. 

 broad, whilst in this species not more than "00015 in. 



2285. Hysterium repanduxn. BIox. " Eepand Hysterium." 



Peritliecia almost free, elliptic ; the lips well rounded ; aper- 

 ture gaping ; asci rather short ; sporidia broadly cymbiform, 

 brown, the apex at one end very slightly elongated and hyaline. 

 —Duhy Hijst.p. 27, t. l,/;6. B. ^' Br. Ann. N.H. (1866), no. 

 1181, i. 5,/. 38. 



On rotten stumps. Twycross. 



Sporidia (•OOOG-'OOOZ in.) •015--0177 m.m. long. 



2286. Hysteriuni Tasriuxn. Fr. *' Variable Hysterium." 



Scattered over pallid spots ; perithecia elliptic, subimmersed, 

 with a slight keel, and very obscure aperture, quite even ; asci 

 elongated ; sporidia uniseriate, elliptic, slightly pointed at either 

 end, uniseptate, nucleate. — Fi\ S.M. ii. p. 582. Duhy Hyst. p. 

 28. B. ^ Br. Ann. N.H. (1866), wo. 1180, t. 5,/. 37. 



On decorticated branches of yew. April. Wynd Cliff. 



Sporidia, with a large nucleus in each division ('001 in), "025 m.m. long, 

 by ("0005 in.) '0127 m.m. broad. At first hyaline, at length pale brown. 



2287. Hysterium Rousselii. he Not. " Roussel's Hysterium." 



Erumpent, oblong or linear, obtuse, parallel, or irregularly 

 disposed, black, opaque, longitudinally striate ; asci subcylindri- 

 cal ; sporidia oblong, more or less constricted in the middle, 3-5 

 septate, fenestrate, hyaline, then more or less brownish. — Duhy, 



