142 



Journal of Agricultural Research 



Vol. IV, No. 2 



measured (Table I). Of 181 pycnidia measured the smallest was 125// 

 and the largest 635/.t in diameter. The largest number fall between 225 

 and 325//. 



Table I. — Variation in size of 181 pycnidia of Phoma betae 



The pycnospores showed quite wide variations in size. The shortest 

 of 204 spores measured 3.8 and the longest 9.4/t. Practically all fell 

 between 4.1 and 7/i, as shown in Table I. 



The width of the pycnospores varied from 2.6 to 4.3/1. The single 

 exception to this case is a spore which measured 4.9/4 in width. Table 

 II will show the distribution of numbers within the limits given. 



Table II. — Variation in size of 204 pycnospores of Phoma betae 



LENGTH 



WIDTH 



