PLATE XV. 



Fig:. 1, section of a gall (after Farlow) Synchytriuni peckii. 



a, sporangium; 6, zoospores. 



- 2, conidiophore and conidium Entomophthora muscae. 



a, germinating conidium. 



" 3, resting spores Entomophthora grylli. 



a, germinating spore; b, common form of resting spore. 



" 4, oogone (after Humphrey) Saprolegnia f erax. 



" 5, zoosporangium (after Lindstedt). . ..Dictyuchus magnusii. 



a, oogones and antherids; b, oospore; c, germinating zo- 

 ospores. 



