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 /J^ ; paraphyses slender, curved at the 

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

 6-9 X I /^. 



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 fx ; 

 paraphyses slender ; conidia cylindrical, straight, hyaline, 

 5-6x1-5 /x. 



Rhytisma salicinum, Fries, Vef. Akad. HandL, 181 9, 

 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 p.\ 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., Sy?nb. Myc, p. 290. — Epi- 

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

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

 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. 



