1893.] NATURAL SCIENCES OF PHILADELPHIA. 165 



Spots numerous, dark grayish-brown, 2-4 mm. diam., suborbicular, 

 definite but without any distinct border, amphigenous. Perithecia 

 epiphyllous, numerous, subprominent, pale, becoming darker, globose, 

 75-80//. diam., perforated above. Sporules abundant, fusoid, hyaline, 

 continuous, faintly nucleolate, straight or a little curved, 12-30 

 (mostly 15-20) x U-Ufi. 



Differs from S. infuscata Winter (on Lepachys pinnata), in its 

 much shorter sporules. 



Septoria negundinis E. & E. 



On leaves of Negundo aceroides, London, Canada. Aug., 1892. 

 (Dearness, No. 19.) 



Spots punctiform, minute, white, amphigenous, with a single peri- 

 thecium in the center, often confluent forming an irregular shaped, 

 angular white spot 2-3 mm. diam. Perithecia at first pale, then 

 black, rather large, the papilliform apex erumpent, amphigenous, 

 but more distinct above. Sporules cylindrical, mostly regularly 

 curved, nucleate, then 1-3-septate, 25-50 x 2/a. 



This must be closely allied to S. acerella Sacc, but that is said to 

 have sporules only 20-22// long, subcoutinuous. 



Septoria carpigena E. & E. 



On dead twigs and fruit of Celtis occidentalis, Mount Cuba, Dela- 

 ware. March, 1892. (A. Commons.) 



Perithecia erumpent in small clusters surrounded by the margin 

 of the ruptured epidermis, ovate-globose, black, rough, with a conic- 

 papilliform, smooth, black ostiolum. Sporules abundant, vermicular, 

 curved or undulate, 4-or more-nucleate, hyaline, continuous, obtuse, 

 20-30 x 3//. 



Micropera fraxini E. & E. 



On bark of dead limbs of Fraxinus americana, London, Canada. 

 Apr., 1892. (Dearness, No. 1,808.) 



Perithecia (cells) peripherical, minute, immersed, with the apex 

 slightly prominent and sometimes collapsing, seated on an olivaceous, 

 hemispheric-tuberculiform erumpent-superficial stroma (paler within) 

 2-1 mm. diam. Sporules cylindrical, hyaline, curved, nucleate, 

 obtuse, about 20 x 5//, borne on stout basidia 15-20 x 3//. 



Seems almost to be a stylosporous Dothidea. 



Excipula canadensis E. & E. 

 On bleached wood of elm rails, London, Canada. Aug., 1892^ 



(Dearness, No. 1,985.) 



