378 PLANT DISEASES 



appearing in the spring on fallen, dead leaves, elongated, 

 wavy, gaping, disc pale ; asci clavate; spores needle-shaped, 

 about 60-80 x i '5-2 '5 /z ; paraphyses slender, curved at the 

 tip; conidia cylindrical, hyaline, straight, or curved, 

 6-9 X i p. 



Rhytisma punctatum, Fr. Stroma black, broken up 

 into small detached pieces, seated on a yellow spot on 

 living leaves ; ascophores circular or elongated ; asci 

 clavate, tip narrowed ; spores 8, needle-shaped, apex blunt, 

 base pointed, arranged in a parallel bundle, 35-40 x i '5-2 /* ; 

 paraphyses slender ; conidia cylindrical, straight, hyaline, 

 5-6 xi -5 p. 



Rhytisma salicinum, Fries, Vet. Akad. HandL, 1819, 

 p. 104. Stroma forming circular or irregular, thickish, 

 shining black patches on the upper surface of leaves ; 

 asci clavate, apex narrowed ; spores 8, needle-shaped, 

 pointed at both ends, curved, continuous, guttulate, hyaline, 

 65-95 X i "5-2 '5 fj.; paraphyses slender, tips wavy. 



Pseudopeziza, Fckl. Parasites or saprophytes ; asco- 

 phore erumpent, sessile, sometimes narrowed at the base, 

 glabrous, minute; asci narrowly clavate, apex usually 

 narrowed, 4-8 spored ; spores hyaline, smooth, narrowly 

 elliptical or fusiform, continuous or i -septate; paraphyses 

 present. 



Pseudopeziza trifolii, Fckl., Symb. Myc., p. 290. Epi- 

 phyllous, sessile, gregarious, in small clusters on dark spots, 

 erumpent, soon plane, dingy yellow, glabrous, about J 

 mm. across ; asci clavate, 8-spored, spores irregularly 

 2-seriate, hyaline, elliptic-oblong, or sometimes slightly 

 broader at the apex, 10-15x5-6 /x; paraphyses hyaline, 

 rather stout, sometimes branched. 



