*J06 Glomerelhi (nn^ulata and its Conidial Fornix 



the former are distiuguished from the latter by their black and bristly 

 appearance; but in some cases acervuli with setae have been observed to 

 have developed on incubation in diseased spots which had formerly 

 acervuli without setae. The same has been observed in the case of the 

 acervuli of the Glomerella on chillies. On only two or three occasions has 

 the perfect form been found on the fruit. This form has been observed 

 to develop in the old diseased spots in which were formerly the acervuli. 

 The pink colour of the acervuli without setae is lost by degrees and changes 

 into black as dark brown coloured hyphae begin to develop from margin 

 inwards. Ultimately the concentric arrangement of the acervuli in the 

 diseased spot is lost and the once round and sunken spot becomes covered 

 by an undulating rugged and carbonaceous crust. The gradual change 

 due to the development of the perithecia is not so well marked in the 

 spots having acervuli with setae on account of the black colour. The 

 formation of the perithecial stage becomes noticeable by the presence of 

 the undulating rugged crust. 



Fruit stalks. 



The disease extends to the fruit stalk from the infected fruit but in 

 a few cases the infection has bfeen observed to originate from the stalk. 

 The diseased stalk becomes dry and hard as does the diseased fruit. 

 These dry stalks with the dead fruits remain hanging on the tree for a 

 long time after they are mummified. So far, the acervuli on the stalks 

 have been found without setae. They are not crowded together or confined 

 to a definite area as on the fruit but they are scattered. 



Sections through a diseased spot show that in the development of an 

 acervulus there is at first in the epidermal and subepidermal cells a 

 collection of hyphae which form a distinct stroma of pseudo-paren- 

 chymatous cells before conidiophores are developed as in the case of 

 chilli Glceosporium. This stroma is at first hyaline but later turns brown 

 from the margin in-wards. The stromatic cells are uninucleate. Conidio- 

 phores are developed from the uppermost cells of the stroma. They are 

 hyaline and broad at the base but tapering at the end (Fig. 9). From 

 the tips of the conidiophores uninucleate elliptical and hyaline spores 

 are cut off in succession. If sections are made through a diseased portion 

 bearing the perfect stage, ])erithecia are found seated on or partly im- 

 mersed in a stroma of loosely interwoven brown hyphae. The neck is 

 usually very distinct but this part of the perithecium is very variable 

 in size. At times it is markedly hairy, as hairy as the perithecia of the 

 chilli GlomereWi figured bv Mi.ss Stoneman; in some cases the neck is 



