OIDIUM LACTIS. 



215 



Fig. 42. Oidiwn lactig (after Hanson). 1, Hyphse with forked partitions; 2, two ends of 

 hyphic one with forked partition, the other with the beginning of a formation of a 

 spherical link ; 3-7, germinating couidia ; 6-6"', germination of a conidium, sown in hopped 

 beer-wort in Ranvier's chamber, and represented at several stages ; at each end germ tubes have 

 developed ; after nine hours (6"') these have formed transverse septa and the first indications of 

 branchings ; 11-14, abnormal forms ; 15, 16, hyphrc with interstitial cells, filled with plasma : 

 17, chain of germinating conidia ; 18, conidia which have lain for some time in a sugar-solution ; 

 the contents show globules of oil ; 19, old conidia. 



