1893.] NATURAL SCIENCES OF PHILADELPHIA. 139 



Thyridium syringae E. & E. 



On dead stems of Syringa (lilac), London, Canada. March, 1892. 

 (Dearness, No. 1,654.) 



Perithecia thickly scattered, buried in the bark, about 2 mm- 

 diam., with thick, coriaceous walls. Ostiolum papilliform, black, 

 barely perforating the bark which is raised into slight pustules but 

 not ruptured. Asci clavate-cylindrical, 75-80 (p. sp. 65)xl2//, 

 (paraphysate)? 8-spored. Sporidia biseriate above, oblong or 

 clavate-oblong 3-(exceptionally 4-) septate, with one or two of the 

 cells divided by a longitudinal septum, yellowish-brown, 12-15 x 5- 



Thyridium americanum E. & E. 



On dead and considerably decayed limbs of Xanthoxylum america- 

 num, London, Canada, April, 1892. (Dearness, No. 1,780.) 



Perithecia evenly scattered or 2-3 lying close together, buried in 

 the inner bark, which is blackened on the surface, 200-400// diam., 

 globose, homogeneous and white inside, contracted above into short 

 necks, their globose or conic-papilliform ostiola piercing the epider- 

 mis and raising it into numerous small pustules. Asci cylindrical, 

 100-115x12-15/7., p. sp. 80-90// long, paraphysate, 8-spored. 

 Sporidia uniseriate, elliptical or ovate, 3-septate and submuriform, 

 constricted at the middle septum, 14-17x8-9//. Very different 

 from Thyronectria xanthoxyli (Pk.). Accompanying the ascigerous 

 perithecia are other similar ones, some of which contain minute 

 spermatia 2i-3xf//, others with sporules oblong-fusoid, hyaline, 

 2-nucleate, 10-12x3//, on clavate-basidia 12-15//. long (Dendro- 

 phoma) f and others (Hendersonia xanthoxyli E. & E.), with oblong- 

 cylindrical, brownish, 3-septate sporules, 10-12 x 3//. 



Anthostomella mammoides E. & E. 



On dead limbs of Ostrya virginica, London, Canada. June, 

 1892. (Dearness, No. 1,801.) 



Perithecia gregarious, about 2 mm. diam., with thick, coriaceous 

 walls, about half sunk in the inner bark, the upper half raising the 

 closely adherent epidermis into strong, dome-like, hemispherical 

 pustules about 1 mm. across, the prominent, large, papilliform 

 ostiola erumpent. Asci cylindrical, paraphysate, 110-120 x 12-15//, 

 8-spored, p. sp. 90-110//, long. Sporidia uniseriate, elliptical, brown, 

 15-22 x 10-13//. 



