2B7 



irregular patches limited by the veinlets of the leaf. Asci cylindrical 

 or clavate-cylindrical, 40 x 6 ft. Sporidia biseriate, narrow-elliptical, 

 uniseptate, 8x3-3| /*. 



On leaves of Myrica cerifera, N. Jersey. 



S. incanescens, (Schw.) 



Sphceria incanescens, Schw. Syn. N. Am, 1796. 



Spharella, incanescens, Cke. in Journ. Bot. March, 1883, p. 107. 



Spots becoming hoary, broadly effused, indeterminate, appearing 

 as if covered with frost. Perithecia punctiform, subglobose, very mi- 

 nute, black, often appearing as if truncate or collapsed. Asci cylindri- 

 cal. Sporidia elliptical, uniseptate, hyaline, 8x3//. 



On Tilia Americana. Pennsylvania (Schw.) 



S. populifolia, Cke. 1. c. p. 197. 



Exsicc. Rav. F. Am. 689. 



Hypophyllous. Perithecia innate-prominent, punctiform, globose, 

 black, subconfluent-aggregated, 3-6 together, in numerous, small, black, 

 subangular groups, or also scattered. Asci cylindrical. Sporidia sab- 

 lanceolate, uniseptate, hyaline, 16-18 x3|-4 a. 



On leaves of Populus angulata, South Carolina. 



In our copy of Rav. F. Am., the specimen shows no fruit. 



S. orbicularis, Pk. 28th Rep. p. 81. 



Perithecia minute, innate, covered by the epidermis, which is at 

 length pierced or ruptured, occupying distinct or subconfluent, brown- 

 ish spots. Asci subcylindrical. Sporidia oblong, uniseptate, colored. 

 10-13 n long. 



On the upper surface of fallen poplar leaves. Center and North 

 Greenbush, N. Y. (Peck). 



The spots on the leaves resemble those of Venturia orbicularis on 

 oak leaves. Sometimes the epidermis peels off revealing the perithe- 

 cia beneath. These are often more numerous near the margin of the 

 spot. 



S. Wistaria?, Cke. Grew VII, p. 54. 



Punctiform. scattered. Perithecia semiininiersed, black, very 

 small. Asci clavate. Sporidia elliptical, uniseptate, 8 x 3 /x. 

 On leaves of Wistaria, South Carolina (Ravenel). 



S. fraxinea, Pk. 35th Rep. p. 145. 



Perithecia numerous, minute (75 /), black, amphigenous, gener- 

 ally collected in groups forming sulx>rbicular spots. Asci oblong. 



