ISO 



THE PHYCOMYCETES 



times been noted in Entomophthora vniscae and in Massospora 

 cicadina [Speare (1921)]. In M. cicadina the sculpturing of 

 the wall is reminiscent of the design on golf balls. 



In E. luiisccie resting spores are formed within the abdominal 

 cavirv^ [Goldstein (1923)] after the death of the fly. They form 

 only after conidial formation is no longer possible, and undoubt- 

 edly they function primarily in hibernation. 



Fig. 42. A. Stages in conidial formation by Entomophthora. B, C, and 



D. Stages in zygote formation in Entomophthora. £, F, and G. Zygote 



formation bv Empiisa jwuosa. (After Rees.) 



Sexual reproductiox. Conjugation with the formation of 

 zygospores is known in only a few species. Rees (1932) ob- 

 served the conjugation of two adjoining hyphal bodies in Ento- 

 mophthora vmscae. A narro\\' isthmus appears at the point of 

 contact of hyphal bodies; then a globular body forms as an out- 

 growth of this isthmus. K nucleus from each hyphal body, to- 

 gether with a quantirv^ of cytoplasm, moyes into the outgrowth, 

 the zygote, and a thickened ^\•all is formed around it. 



A somewhat different situation prevails with Basidiohohis 

 raiianim. In this species a pair of beak-like protrusions forms on 

 each side of the septum separating adjoining cells. The single 

 nucleus from each parent cell passes into the beak and divides, 

 and one daughter nucleus of each pair passes back into the parent 



