carefully studied in Maine 2 and they are usually regarded as 

 plants. 



Class II. SCHIZOMYCETES. Include the bacteria, many 

 of which are useful to man ; others produce serious diseases in 

 man and animals, and some produce diseases in plants, as the 

 pear blight (Micrococcus amylovorus). They are not, however, 

 considered as true Fungi. 



Class III. PHYCOMYCETES (lower or algal-fungi). 



Order Mucorace;e. Including most moulds except the ordin- 

 ary green mould. 



Order Peronosporaceae. Including "white rusts" and "downy 

 mildews." Of considerable economic importance. 



Order Saprolegniaceae. Aquatic moulds often parasitic on 

 fish and causing much trouble in fish hatcheries. 



Order Entomophthoraceae. Mostly parasitic on insects and 

 are beneficial. 



Order Chytridiaceae. Simple parasites affecting a few of the 

 higher plants. 



Class IV. DEUTEROMYCETES. Commonly known as 

 "imperfect fungi," of which there are three orders. Many of 

 these are probably stages in the development of ascomycetous 

 fungi. A few are of considerable economic importance ; but 

 comparatively little is known of their life histories. 



Class V. 'ASCOMYCETES (spore-sac fungi). 



Order Saccharomycetaceae. Yeast plants. 



Order Pyrenomycetaceae. 



Family Perisporiacere. Including the "powdery mildews," 



which are of considerable economic importance. 

 Family Sphaeriaceae. Includes the "black knot." Mostly 



saprophytic forms. 



Family Hypocreaceae. Includes the ergot of grain. 

 Familv Dothideacese. 



Family Microthyriaceae. 

 Family Lophiostomaceae. 



Many saprophytic forms. Of 

 little economic importance. 



Family Hysteriaceae. 



Family Laboulbeniaceae. Minute fungi found on insects. 



No economic importance. Their position in classification 



is uncertain. 



2. By Professor F. L. Flarvey. 



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