834 SPHiEEIACEI. 



2498. Valsa stilbostoma. Fr. " Pallid disc Valsa." 



Perithccia disposed in circles, covered with a waxy, dirty-white 

 disc ; ostiola prominent, scattered, bursting forth, and at length 

 obliterating the disc ; sporidia biseriate, colourless, acuminate- 

 elliptic, constricted ; endochrome bipartite. — Fr. S.V.S.p. 411. 

 Curr. Linn. Trans, xxii. #. 48, /. 140. S. stilbostoma, Fr. S.M. 

 i\.p. 403. Fries, exs. no. 145. Valsa rhois, Cooke exs. no. 24,b. 



On various dead branches (except beec'h). [United States. J 



Sporidia ("OOO/ in,) •0177 m.m. long. 



2499. Valsa oncostoma. Buby. " Locust tree Valsa." 



Speemogonia. — Nestling in the wood, replete with a yellowish 

 gelatine; sjDcrmatia oblong-lanceolate, simple, hyaline. 



AscoPHORE. — Perithecia mostly circinating ; ostiola long, 

 convergent, crowded ; asci elongated, sessile ; sporidia oblong- 

 lanceolate, uniseptate, quadrinucleate, hyaline. — Fckl. exs. no. 

 1730. Sphceria oncostoma, Duly in Kl. exs. no. 253. Diaporthe 

 oncostoma, FcJcl. Sym. Myc. p. 205. 



On Rohinia pseudacacia. Swanscombe. 



2500. Valsa circumscripta. Mont. " Guelder rose Valsa." 



Perithecia either simple and scattered, or 3-4 together, glo- 

 boso-depressed, occupying the inner bark, at first covered by the 

 cuticle, which at length vanishes, blackish; ostiola papillate, or 

 conical ; asci narrowly oblong or subcylindrical, sessile ; sporidia 

 narrowly fusiform, acute, hyaline, quadrinucleate, uniseptate (at 

 length quadricellular). — Mont. Syll. p. 220. SplicBria circmn- 

 scripta, Fr. Ann. Sc.Nat. i.p. 298, t. 13, y. 2 {inaccurate). Dia~ 

 •portlie circumacriiita, Fcld. exs. no. 1991. Diaporthe BecJchausii^ 

 Nke. Pyr. Germ. \.p. 295. 



On twigs of Viburnum. Darenth. 



Althougb the fruit does not absolutely agree witli Montague's description, 

 the sporidia being acute and usually ouly uniseptate, it appears to be the 

 game species. 



2501. Valsa enteroleuca. Fr. " White disc Valsa." 



Orbicular, convex, free ; stroma white; perithecia small; os- 

 tiola crowded, free, globose, or beaked, somewhat wrinkled ; 

 sporidia biseriate, colourless, oblong, acuminate at each end, 

 constricted, often slightly curved, quadrinucleate, uniseptate. — 



