COLLETOTRICHUM 441 



Gloeosporium affiiie (Sacc.) forms whitish spots on Hoya 

 leaves in hothouses. The pustules appear on the spots on 

 the upper surface of the leaves. Conidia cylindric-oblong, 

 14-20X4-6 ft, and ooze out in tendrils. 



Gloeosporium cytisi (B. and Br.) form pale spots bounded 

 with red, on laburnum leaves. Conidia oblong, 7-10 x 

 2-3 \i. 



Gloeosporium bidgoodii (Cooke) forms pustules, covered by 

 the blackened epidermis, on the leaves of cultivated species 

 of Oncidium. Conidia narrowly elliptical, 18-20X4 l l - 



Gloeosporium pelargonii (Cke. and Mass.). The leaves 

 are attacked on the under surface, but no distinct spots are 

 formed, minute pustules are scattered over the surface, more 

 especially near the veins. Conidia oblong, 20X4-5 I 1 - 

 Attacked leaves soon droop and wither. 



Gloeosporium cydoniae (Mont.) forms blotches on living 

 quince leaves, causing defoliation. 



Conidia cylindrical, slightly curved, hyaline, 15-20 x 

 2-2-5 l l - 



COLLETOTRICHUM (Corda) 



Spore-beds innato-erumpent, plane, black, conidia fascicu- 

 late, continuous, hyaline ; long, blackish bristles are mixed 

 with the conidiophores. 



Doubtfully distinct from Gloeosporium, the only difference 

 consisting in the presence of sterile bristles in the present 

 genus. 



Pod scab of scarlet-runner (Colletotriclium lindemuthiatium, 

 Briozi and Cavara) causes serious losses at times to growers 

 of scarlet-runners. French beans are also sometimes attacked. 

 The pods suffer most ; less frequently the stem and leaves 

 are also infected. On the half-grown pods the disease first 

 appears under the form of small, dark spots bounded by a 

 reddish band ; the spots gradually increase in size and 

 encroach on each other, forming irregular patches, which in 

 course of time sink below the general level of the surface. 

 At a later stage the fruit of the fungus appears under the 

 form of minute, black dots on the sunken patches. When 

 the fungus attacks the stem, it usually enters and destroys the 

 tissues to such an extent that the portion above the wound 

 dies. 



