-31- 



(3) Abundant surface mycelium with apparently no spores. 

 Strain 8 tha only strain. 



Strain 2, which had always reoiained in a class by itself, failed 

 to develop. 



All the fon, that developed, with the exception of 8 and 12 

 resembled strain 1, or the California fmit rot strain. 



In this lot of inoculations there were only two colors repre- 

 sented, drab(S) and cream(S). Strain 12 had the cream-colored pustules, 

 and all the others had drab -colored pustules with the exception of 8 

 which apparently had no spores. 



After the experimental work which has been described above had been 

 cornpleted it was d cided that there m-ere four possible forms among the 

 cultures, 1, 2, 8 and I?, being the typical forms. Strain 8, the California 

 strain obtained from an apricot leaf, was discarded at this stage of the 

 work. Single spore strains of 2 and 12 were obtained it* the conventional 

 manner. Strain 1 was already a ringlc spore strain. Because of the 

 peculiar behavior of strain 4 a single spore culture of it was also 

 obtained, and likewise a single spore strain of 3* These single spore 



strains were used to ake planted plate cultures on Ctapeck's agar. 



1. Czepeck's fa gar 



Distilled water 1000.00 cc 



Magnesium sulfate .50 grams 



Dipotaeeium hydrogen phosphate 1.00 



Potassium chloride 50 



Ferrous sulphate .01 



Sodium nitrate 2.00 



Cane sugar 30.00 



Agar agar 15.00 



