430 PLANT DISEASES 



forming brown spots on the leaves, and light yellowish- 

 brown to black sunken spots on the petiole and stalk; 

 spores irregularly oblong, hyaline, flesh-colour in the mass, 

 11-28x5 /«■; conidiophores colourless, cylindrical; setae 

 dark brown, abundant, once or twice septate, usually 

 colourless below, 60-109 X 3-5 /*. 



Colletotrichum gossypii, Southw., Journ. Myc, 1890, 

 p. 100, pi. iv. — Sori orbicular, dark-coloured, or covered 

 with a pink powder ; acervuli erumpent ; conidia irregularly 

 oblong, usually with a lighter spot in the centre, often 

 acute at one end, colourless singly, flesh-coloured in mass; 

 conidiophores colourless, varying in length, at least longer 

 than the mature spore, produced on a stroma ; setae single 

 or in tufts, dark brown at base, nearly colourless at the 

 apex. 



Cylindrosporium, Unger. — Pustules or nuclei formed 

 under the epidermis, white or pallid, discoid or subeffused ; 

 conidia filiform, continuous, hyaline, often flexuous. 



Considered as conidial forms of species of Entyloma. 



Cylindrosporium chrysanthemi, Ellis and Dearn., Can. 

 Rec. Sci., 1893, p. 271. — Spots rather indefinite, i cm. 

 and more broad, becoming blackish; pustules innate, on 

 both surfaces, 100-170 \t. diam. ; conidia fusoid, almost 

 straight, 50-100 X 3-4'5 /«., at length escaping. 



Cylindrosporium padi, Karsten, Symb. Myc. Fenn., 

 pt. XV. p. 159. — Forming angular, brownish spots on both 

 sides of the leaf; pustules hypophyllous, covered by the 

 inflated epidermis; conidia filiform, flexuous, hyaline, 

 eventually appearing at the surface, 48-62 x 2 /i. 



Libertella, Desm. — Acervuli or conidia masses of various 



