274 



Journal of Agricultural Research 



Vol. XIII, No. 5 



served to be club-shaped as described by Appel and Laibach (j), but this 

 may be due to differences in the character of the medium used. A gela- 

 tinous exudate seemed to accompany the production of spores, which 

 sometimes held numbers of spores together in a perfect sphere, probably 

 due to surface tension, at the end of the condidiophore (fig. 3, A). After 

 a sufficient number of spores had been produced, this tension evidently 

 lessened, allowing the spores to scatter. The entire period from the unripe 

 spore to the mature stage again producing spores was only 40 hours. 



■«223 



Fig. 4. — Marssonina panatt(niiana:>Myce\mm, condiophores, and conidia produced on pnme-juice agar, 

 40 hours after the spores were sown (X250). 



GROWTH ON VARIOUS MEDIA 



Pure cultures of the fur gus were transferred to a number of different 

 kinds of media in test tubes to study its reaction to various diets. The 

 use of so many different kinds of media seems now to have been useless 

 labor, as very little difference was observed in the character of growth, 

 except on widely different media. The cultures were all started on the 

 same day, and the results recorded on the fifth day follomng (Table I). 



