485 



V. leiicostoma, (Pers.) 



SphcEria leucosloma, Pers. Syn. p. 39. 

 Valsa Persoonit, Nits. Pyr. Germ. p. 222. 

 yaisa leiicostoma, Fr. Suinm. Veg. Sc. p. 411. 

 Exsicc. EU. N. A. F. 173.— Rav. F. An.. 364. Thuni. F. Austr. 256. 



Stromata strongly convex, 2-3 mm. diam., scattered irregularly, 

 sometimes confluent, finely granular and whitish inside, the outer layer 

 coriaceous and darker, and closely adnate to the inner surface of the 

 epidermis. Disk erumpent through short, transverse cracks in the 

 epidermis, white, dotted with the black, rounded, slightly projecting 

 ostiola. Asci fusoid-clavate, 35-45 x 7-8 n, subsessile. Sporidia 

 biseriate, allantoid, hyaline, not strongly curved, 9-12 x 2-2| fi. 



On peach, plum and almond trees, Carolina, Pennsylvania, New 

 Jersey, and probably throughout the country where these trees are 

 found. 



This species closely resembles V. nivea, but in our American 

 specc. the asci and sporidia are larger. The stromata also are larger. 

 In both, the stroma with its enclosing shell (conceptacle) remains 

 attached to the epidermis when it is peeled off, appearing like little 

 blisters on its inner surface. 



V. pjillida, E. & E. (in Herb.) 



Stroniata numerous, crowded, but mostly not confluent, occupying 

 definitely limited areas, small, conical, base elliptical, 1-1 j mm. diam., 

 lighter colored inside, enclosed in a thin, black layer, penetrating to 

 the liber, but not to the wood. Perithecia few, 4-8, lying near the 

 bottom of the stroma, small and rather pale, ^ mm. diam., contracted 

 into slender necks rising together through the center of the stroma, 

 their apices enlarged into obtuse, papilliform, finally substellately 

 dehiscent, black ostiola erumpent through a small, orbicular, sub- 

 ferruginous, loosely granular or farinaceous disk, which pierces the 

 epidermis but does not rise much above it. Asci clavate, 8-spored, 

 30-35 x5 ju. Sporidia subbiseriate, allantoid, slightly curved, hyaline, 

 6-8xU-li/i. 



On bark of willow, Clyde, N. Y. (0. P. Cook, No. 360). 



V. subclypekta, C. & P. 27th Rep. N. Y. State Mus. p. 109. 



Exsicc. EU. N. A. F. 91. 



Stromata gregarious, minute, (1 mm.), covered by the blackened 

 epidermis, convex-hemispherical, lighter inside, raising the epidermis 

 into little pustules. Perithecia 3-5 in a stroma, subglobose, minute 

 (150 u). Ostiola erumpent (not exserted), in a small, black disk, sur- 



