705 

 H. vulvatum, (Schw.) 



Hysterium vulvatum, Schw. Syn. N. Am. 2072. 

 Hysterographium vulvatum. Sacc. Syll. 5774. 

 Exsicc. Rav. F. Car. II, 48. Ell. N. A. F. 76-Thum. M. U. 181. Rehm Asc. 315. (In all 

 these under the name of H flexuosum, Schw.). 



Perithecia erumpent-superficial, scattered or gregarious, 1-3 mm. 

 long, straight or flexuous; lips at first closed, then open so as to leave 

 a wide furrow between them, mostly with 1-2 deep striae on each side, 

 often apparently double, i. e., one set within another. Asci oblong- 

 clavate, obtuse, paraphysate, 8-spored, p. sp. 100-112x20-25 /i, with 

 a stipe 30-35 fi long. Sporidia irregularly biseriate, broad-fusoid, 

 slightly curved, multi- (10-15-) septate, and muriform, strongly con- 

 stricted in the middle, the upper part broader, olive-brown, 50-62 x 

 15-20 /i. 



On dead, dry, mostly decorticated limbs of oak and other decid- 

 uous trees, common. 



The species here described as H vulvatum, Schw., is certainly 

 the Hysterium vulvatum of the Schweinitzian Herbarium, but whether 

 the specimen so labeled in that collection is the Hysterium vulvatum 

 of Schw. Synopsis N. Am. 2072, may be open to some doubt. The 

 specc. in the Exsiccati above referred to, certainly agree well with the 

 diagnosis of H flexuosum, Schw., in his Syn. Car. No. 249. 



H. Lesquereiixii, (Duby). 



Hysterium Lesquereuxii ', Dub3', Hyst. p. 29. 



{Hysterium Jibrisedum, Ger. Bull. Torr. Bot. Club, V, p. 26)? 



Perithecia scattered or aggregated, black, faintly rugulose under 

 the lens, ovate or ovate-oblong, or sublinear, often flexuous, narrowed 

 towards each end, subacute; lips swollen, partially open so as to leave 

 a distinct cleft between them. Asci cylindric-clavate, 80-100 x 12-15 t u, 

 paraphysate, 8-spored, subsessile. Sporidia subbiseriate, ovate-oblong, 

 slightly constricted in the middle, obtuse, 5-7-septate and muriform, 

 pale brown, 20-25 x 8-10 p.. 



On corticated branches of Gleditschia triacanthos, Ohio (Les- 

 quereux), Louisiana (Langlois). 



The diagnosis is from the Louisiana specc. There is sometimes a 

 distinct furrow on each side of the lips and parallel with them, but 

 often this is entirely wanting. H.fibrisedum, Gerard, probably be- 

 longs here, but we have seen no specimens. 



H. prominens, (Phil. & Hark.) 



Hysterium prominens, Phil. & Hark. Bull. Cal. Acad. Feb. 1884, p. 25. 

 Hysterium Ceanothi, Phil. & Hark. 1. c. 



Hysterographium prominens, Berl. & Vogl. Add. Sacc. Syll. I, p. 270. 

 Exsicc. EH. & Evrht. N. A. F. 2d Ser. 2064. 



Perithecia erumpent-superficial, gregarious or scattered, elliptical 

 89 



