II. 



BENEFICIAL FUNGI. 



The fungi classed under the above head include those par- 

 asitic species damaging weeds, and injurious plants, hence they 

 are to be classed as beneficial to the farmer. 



ENTOMOPHTHOKACEAE. THE INSECT FUNGI. 



EMPUSA MUSCAK (Fr. ) Cohn. Fly fungus. On the common house 

 fly. It has been very plentiful here this year, appearing earlier 

 than usual. The affected flies may be readily recognized,as they 

 attach themselves to the walls, curtains, &c., and soon become 

 more or less distended, and covered with a whitish powdery sub- 

 stance (the spores). After hanging for some time in this man- 

 ner they become surrounded by a white circle of spores- 



PERONOSPORACEAE. 



PERONOSPORA OYPARISSIAE, DeBary. Mildew of spurge. On leaves 

 and stems of spurge (Euphorbia spp.). Showing as a violet 

 tinged mildew on the affected parts. It causes the plants to 

 assume an upright mode of growth, ( Coiiidia deeply tinged with 

 violet; 13 18u, Ellipsoid). Very plentiful. The affected 

 plants were usually quite badly damaged. 



PERONOSPORA LEPTOSPERMA, DeBary. On under side of leaves 

 of wormwood (Artemisia biennis). Common. Frequently 

 doing considerable damage to the host by causing the leaves 

 to turn yellow, dry up, and fall off. July September. 



SCLEROSPORA GRAMiNrcoLA, (Sacc. ) Schroet. Mildew of grass. 

 Very common this season on fox tail ( Setaria viridis). 1 1 



