1893.] NATURAL SCIENCES OF PHILADELPHIA. 137 



Perithecia gregarious, elliptical in a horizontal section, about ■]- 

 mm. diam., strongly convex, flattened at base and fringed with short 

 mycelium, strongly prominent but closely covered by the blackened 

 epidermis, umbilieately perforated above. Asci clavate-cylindrical, 

 sessile or nearly so, paraphysate, 60-65 x 10-12/*. Sporidia crowded- 

 biseriate, cuneate-clavate, 3-septate, obtuse above, at length distinctly 

 constricted at the septa, 12-16 x3?/*, hyaline, not curved. 



Differs from M. graminum Sacc. in its much larger, and distinctly 

 prominent perithecia. The sporidia are about the same as in that 

 species ; differs also essentially from Leptosphceria orthogramma (B. 

 & C.) on the same host. 



Metasphaeria fuscata E. & E. 



On bark of small, dead oak limbs, (Qtiercti* coccinea), Newfield r 

 N. J. Oct., 1892. 



Perithecia gregarious, about } mm. diam., covered by the epider- 

 mis which is blackened over them and raised into rather flattish 

 pustules, which are pierced by the minute papilliform ostiolum, but 

 not ruptured or torn. The surface of the bark between the pustules 

 is of a smoky hue. Asci oblong-cylindrical, sessile, 75-100 x 12— 

 15/*, 8-spored, with slender filiform paraphyses. Sporidia over- 

 lapping-uniseriate, oblong, hyaline, 3-septate and constricted at the 

 septa, rounded at the ends, straight or nearly so, 19-22 x 7-8/*. 



Comes near M. leiostega, but differs in the blackened epidermis 

 and narrower, oblong sporidia constricted at the septa. 



Metasphaeria microecia E. & E. 



On dead twigs and limbs of Acer spicatum, London, Canada^ 

 May, 1892. (Dearness, No. 1,829.) 



Perithecia scattered or subgregarious, minute, (!-? mm.), white 

 inside, buried in the bark which is raised into minute pustules and 

 barely pierced by the minute, papilliform ostiola. Asci oblong- 

 cylindrical, short-stipitate, obscurely paraphysate, 70-85 x 18-27/*, 

 8-spored. Sporidia biseriate, fusoid, slightly curved, 5-6-nucleate, 

 constricted between the nuclei, hyaline, 40-45 x 7-1 0/*. 



The sporidia are about the same as in M. myricce Pk. but our 

 species is readily distinguished from that by its minute perithecia. 

 Zignoella nyssaegena E. & E. 



On outer bark of living Nyssa multiflora, Newfield, N. J. Nov., 

 1892. 



Perithecia loosely gregarious, superficial, membranaceous, black 

 and subshining, ovate-globose, about 150/*. diam., perforated above. 

 10 



