128 THE PHYCOMYCETES 



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ENTOMOPHTHORALES 



The Entomophthorales, as their name indicates, are insect- 

 devouring fungi. The order is constituted of about 6 genera 

 containing 60 species, mostly parasitic on plant lice, flies, scale 

 insects, and the larvae of butterflies and beetles. They may at 

 times be so destructive to insects as to cause epidemics. Out- 

 breaks of plant lice on clover and on citrus have been suddenly 

 checked by species of Entomophthora. Basidioboliis ranarum 

 occurs on the excreta of lizards and frogs. Several species of 

 Conidiobolus occur on the pilei of Auricularia, Hypochnus, and 

 other Basidiomycetes. Completoria complens is parasitic on fern 

 prothalli. Nearly everyone is acquainted with Entomophthora 

 miiscae through having seen dead houseflies sticking to attic win- 

 dows. Immediately surrounding such flies and covering the 

 pane is a white, mealy patch produced by the pathogen. 



