258 PROCEEDINGS OF THE AMERICAN ACADEMY. 



the original transfer is due to the fact that the potato agar used as nutri- 

 ent is not a favorable subtratum for their production. 



The disposition of these transfers may be seen in Table VI. 



TABLE VII. Culture F. 



Dec. 22, zygospore material received from Prof. W. C. Coker, Chapel Hill, N. C, 



and used in inoculating orange potato agar. 

 Dec. 24, young zygospores laid separate on agar in Petri dish. 

 Dec. 25, pure mycelial transfers made from germinated suspensors into test-tubes. 



TABLE VIIL Culture G. 



Dec. 27, zygospore material received from Prof D. H. Campbell, Stanford Uni- 

 versity, Cal., and used in inoculating orange potato agar. 

 Dec. 29, young zygospores laid separate on agar in Petri dish. 

 Dec. 30, pure mycelial transfers made from germinated suspensors into test-tubes. 



Strain Equivalents. 

 A(-) A(+) 



Gl g2 



Gil G3 



GIV 

 G V 

 G VI 



G7 (germination 

 from a young 

 zygote). 



