ERYSIPHE 01DIUM. 



135 



Fig. 21 A. Mucor corymbifer. (After Lichtheim.) 

 Zeiss C, eye-piece 4. 



Fig. 2lB. Mucor corymbifer. After rupture of the wall of the 

 sporangium. (After Lichtheim). 



Zeiss E, eye -piece 5. 



