Classification, 79 



Analijtical Key to Families, 

 A. Hypliae well developed. 



I. MuCORACEiE, 



Hyplic© producing sporangia; asexual organs of 

 reproduction, gonidia produced in sporangia and 

 chlamydogonidia ; sexual form, zygospores. 



Aerial fungi ; developing on various decaying 

 organic substances. 



II. Peronosporace.e. 



Hyplise frequently branched, bearing zoogonidia, 

 or passive gonidia that germinate directly ; asexual 

 organs of reproduction, gonidia ; sexual, oospores. 



Aerial fungi ; eudoparasitic on living plants, more 

 especially on the leaves. 



III. Saprolegniace^. 



Hyphje bearing zoogonidia; asexual reproduction 

 by zoogonidia; sexual by antheridia and oogonia, 

 producing oospores. 



Aquatic fungi ; growing on fish, insects, or aquatic 



plants. 



IV. Entomophthorace^. 



Hyphse bearing gonidia ; asexual reproduction by 

 gonidia and by thick-walled resting spores ; sexual by 

 zygospores. 



Aerial fungi ; developing in living insects, and after 

 the insect's death emitting gonidiophores ; rarely para- 

 sitic or saprophytic on plants. 



B. Hyphse obsolete. 



Y. Chytridiace^. 

 Sporangia alone_, without mycelium; asexual re- 



