2{i7 



ii'regnlar patches limited by the veinlets of the leaf. Asci cylindrical 

 or clavate-cylindrical, 40 x 6 p.. Sporidia hiseriate, narrow-elliptical, 

 nniseptate, 8x3-3| n. 



On leaves of Myrica ccrifera, N. .Terse}-. 



S. incanescens, (Schw.) 



Sph(evia incanescens^ Schw. Syn. N. Am. 1796. 



SphtErella, incanescens^ Cke. in Journ. Bot. March, 1883, p. 107". 



Spots becoming hoary, broadly effused, indeterminate, appearing 

 as if covered with frost. Perithecia punctiform, subglobose, ^ery 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, lilack, 

 subangadar groups, or also scattered. Asci cylindrical. Spoi'idia sub- 

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



On leaves of Populus angulata, South Carolina. 



In our copy of Ra\'. 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 fi 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 orhicularis on 

 oak lea-\'es. Sometimes the epidermis peels off revealing the perithe- 

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

 spot. 



S. Wistarise, Cke. G-rev. VII, p. 54. 



Punctiform, scattered. Perithecia semiimniersed, lilack, very 

 small. Asci clavate. Sporidia elliptical, uniseptate, 8x3 p.. 



On leaves of Wistaria, South Carolina (Ravencl). 



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



Perithecia numerous, minute (75 p.), black, auiphigenous, gener- 

 ally collected in groups forming suborl)icular spots. Asci oblong, 



