268 



THE FUNGI WHICH CAUSE PLANT DISEASE 



our knowledge, it may be best to regard the various forms we 

 have studied as varieties of one species." 



Among the hosts of G. rufomaculans may probably be num- 

 bered at least apple, grape, pear, quince, peach, tomato, egg- 

 plant, pepper, sweet pea "^^ and cherry.-"' 

 G. rufomaculans var. cyclaminis P. & C.^^' 

 Perithecia densely gregarious, indefinite, hght-colored, around 



spots, brown, membranous, 

 subglobose or distinctly ros- 

 trate, ostiolate; asci clavate- 

 cylindric, apex pointed, SO- 

 BS X 8-9 /i; spores oblong 

 to elhptic, 16-18 x 4-4.5 fx. 

 Conidia (=Collctotri- 

 chum) ; acervuli amphi- 

 genous, brownish, large ; 

 conidia oblong to linear, 

 obovate, straight, or slightly 

 curved, ends round, 12-15 x 

 4-5 fi; conidiophores long, 

 slender; setae free, short, 

 rigid. 



This variety is reported 

 on greenhouse Cyclamens, 

 causing leaf spotting. Ma- 

 ture perithecia were found 

 on the leaves. Cultures 

 from the ascospores gave a 

 Colletotrichum as the co- 

 nidial form and a similar Colletotrichum collected from the leaves 

 in pure culture gave the Glomerella. 

 G. cingulata (Atk.) S. & S. 



Perithecia cespitose, stromate, dark-brown, flask-shaped, mem- 

 branous, 250-320 X 150 /x, shortly rostrate, more or less hairy; 

 asci clavate, 64-16 fi; spores hyaline, eUiptic, slightly curved, 

 20-28 X 5-7 M- 



ConicUa ( = Glceosporium cingulatum); acervuU 100-150 fi, 

 rupturing the epidermis, in age black; conidiophores numerous, 



Flu. 197. — G. rufomaculans. Pustules on 

 apple, enlarged. After Spaulding and von 

 Schrenk. ' 



