Jehangir Fardunji Dastur 247 



as in other species of this genus. They are elliptical with broad round 

 ends, hyaline in colour and have an oil globule in the centre (Fig. 3). 

 They measure 11-0-21 x 4-4-5-5yLt. 



This development of the acervulus of G. piperatum E. and E. is 

 similar in all its details to that of ColletotricJmm Lindemuthianum (Sacc. 

 and Mag.) Br. and Cav. as described by Edgerton^ except that in the 

 former the stroma of pseudo-parenchymatous cells distinctly precedes 

 the formation of conidiophores while in the latter the stroma is of a later 

 origin. 



Specimens of CoUetotrichum nigrum E. and Hals, on chilli fruits col- 

 lected in Burma and Pusa show that this fungus agrees in all characters 

 with G. piperatum except that the acervuli of C. nigrum have long rigid 

 dark brown setae up to 150/x long and 4jm broad. 



The perfect stage of G. piperatum and CoUetotrichum nigrum has 

 not previously been recorded on the host plant but at Pusa it has been 

 found on fruits on rare occasions. Miss Stoneman^, who succeeded in 

 growing in cultures the perithecial stage of G. piperatum, named it 

 Gnomoniopsis piperata which was subsequently changed to Glomerella 

 piperata (Stoneman) Spauld. and v. Sch. ; and Taubenhaus^ considers, 

 from inoculation experiments, Gl. rufomaculans (Berk.) Spauld. and 

 V. Sch., which is the same as Gl. cingulata (Stoneman) Spauld. and v. Sch. 

 according to Edgerton*, to be the perfect stage of C. nigrum. Butler^ 

 is inclined to think Gl. piperata (Stoneman) Spauld. and v. Sch. is 

 synonymous with Gl. cingulata. The author is of opinion, for reasons 

 given below, that G. piperatum and C. nigrum are identical and that 

 their perithecial stage is Gl. cingulata (Stoneman) Spauld. and v. Sch. 



Growth of Gl. piperatum E. and E. in cultures. 

 Cultures on glucose-meat-extract-agar started from conidia give 

 for the first few generations a fairly abundant aerial growth which to 

 begin with is white but soon turns pink owing to the development of 

 spores. In places, the culture turns black or greenish black on account 

 of the formation of strands of dark brown hyphae, especially at the lower 



^ Edgerton, C. W. The Bean Anthracnose. Louisiana Agric. Expt. Sta. Bull., 119, 

 April, 1910, p. 5. 



~ Stoneman, B. A comparative Study of the Development of some Anthracnoses. 

 Bot. Gaz., XXVI, p. 104, 1898. 



3 Taubenhaus, J. J. A further Study of some Gloeosporiums and their Relation to a 

 Sweet Pea Disease. Phytopathology, n. No. 4, p. 159, 1912. 



■» Edgerton, C. W. The Physiology and Development of some Anthracnoses. Bot. Gaz., 

 XLV, p. 401, 1908. 



^ Butler, E. J. Fungi and Disease in Plants, p. 355, 1918. 



