BY F. W. WAKEFIELD. 



31 



CONCLUSIONS. 



(1) That the variation in length of conidia of Macro- 

 sporhim cladosporioides, Desm., is of the Normal 

 type. 



(2) That the distribution of frequency of spore-lengths 

 in Alternaria llrassicse (Berk?), Sacc, var. Citri, 

 Penz., is irregular. 



(3) That the morphologically identical conidia of 

 Macrosporhnn and Alternaria may be differentiated 

 by their respective variability. A study of varia- 

 tion in length of detached free conidia will indi- 

 cate their solitary or concatenate origin. 



Stior-g-jcncfe. 



Micros|\cnum alliorvm. 

 Alfemaria cUri. 



tiAT Citn , Bu. 



J31L. 



Macro»Koriun\. 



■'"IS" 



~sr 



-w 



-4T 



