BLAKESLEE. — SEXUAL REPRODUCTION IN THE MUCORINEAE. 305 



TABLE XII. 



TiiALLic Condition of Forms Investigated as Determined bt 

 Hybkidization. 



VegetJitive Differentiation 

 Shown by the ( — ) Strain. 



Ileterotliallic. 

 (-) 



Spores distinctly 



smaller. Sporan- Mucor in. 

 gial growth lower 

 and darker. 



Sporangial growtli Mucor n. 

 lower and lighter in 

 color. 



Sporangial growtli less Phycomyccs. 

 dense. Sporangio- 

 phorc's more slender. 



Mycelial growth less M. Mucedo. 

 vigorous under cul- 

 tivation. 



Sporangia later in de- Mucor v. 

 velopment. 



Sporangial growth Mucor vi. 

 slightly denser and 

 lower. 



Mucor IV. 



Absidia. 

 Rhizopus. 



M. Mucedo var. A. 



Circinella umbellata. 

 Syncephalastrum. 



Chaetocladium 



nov. sj). 



Ilomothallic. 

 (+) and (-) 



Mucor I. 



Heterothallic. 



(+) 



Mucor III. 



Mucor N. 



Phycomyces. 



M. Mucedo. 



IMucor IV. 



Absidia. 

 Rhizopus. 



Cunning- 

 hamella. 



Other have been called (+). Before the possibility of correlating the 

 opposite strains of different species was discovered, they were repre- 

 sented in cultures by arbitrary symbols, and though it seemed not im- 

 possible that the difference in strain luxuriance characteristic of certain 



VOL. XL. —20 



