EMPUSACEAE— ASCOIDEACEAE 



37 



2. Sporocarps not hollow 



a. Sporocarps sclerotioid; spores parallel in a 



peripheral layer 



b. Sporocarps not sclerotioid; spores more or 



less irregularly arranged 



Sclerocystis 7:218; F 267 

 Endogone 8:905, 14:829; F 265 



Family 6. EMPUSACEAE 



Schroeter 134; Fitzpatrick 281 



Mycelium usually well-developed, tubular or filamentous, mostly parasitic, 



usually endozoic, rarely saprophytic, at first 1-celled, then septate; propagation by 



simple conidia terminal on 1-celled clavate conidiophores; zygospores tj'pically 



globose and naked. 



A. Mycelium entomogenous 



1. Conidia superficial, smooth, discharged forcibly 



from the conidiophore 



2. Conidia internal, verrucose 



B. Mycelium not entomogenous 

 1, Mycelium abundant, not intracellular 



a. Conidium borne on a conical cell, forming 

 spores endogenously 



Empusa 7:291; S 138, F 292; 2 

 Massospora F 289 



b. Conidium not on a conical cell, producing a 

 germinating tube and secondary conidium 



Mycelium scanty, intracellular; in fern pro- 

 thalia 



Basidiobolus 

 F 283; 2 



Conidiobolus 

 F 286; 2 



7:285; S 141, 



7:285; S 141, 



Completoria 7:286; S 140, F 288 



Family 7. ASCOIDEACEAE 



Schroeter 145; Fitzpatrick 307 

 Mycelium abundant, in sap of spermaphytes; conidia clustered or catenate on 

 simple conidiophores; sporangia elongate, arising by copulation or apparently 

 asexually and producing many non-motile spores. 



A. Conidia catenate; sporangia produced by copula- 



tion Dipodascus 11 :439; S 146, F 307 



B. Conidia clustered; sporangia asexual Ascoidea 10:71; S 145, F 309 



Order 3. VAUCHERIALES 



Unicellular multinucleate filamentous or saccoid algae and fungi; propagation 

 by zoospores or aplanospores, or in aerial forms by conidia (sporangia) and zoo- 

 spores; reproduction in the tTiree fungous families by means of unlike gametes, pro- 

 duced in antherids and oogones. 



Key to Families 



A. Aquatic fungi, propagating by zoospores or 



aplanospores 



1, Mycelium mostly well-developed; typically ex- 



ternal parasites or saprophytes 



2. Mycelium scanty, developing mostly or wholly 



into sporangia and sex-organs; endobiotic, 

 usually in a single host-cell 



B. Aerial fungi propagating by conidia; typically 



parasites in higher plants 



Saprolegniaceae p. 38 



Ancylistaceae p. 39 

 Peronosporaceae p. 40 



