SIPHONOPHYCEAE 335 



Class 8. PHYCOMYCETEAE. Tube Fungi. Lower Fungi. 

 Filaments tubular, mostly irregularly 

 branched, chlorophyll-less. (About 

 400 species.) 



Order SAPROLEGNIALES. Typically aquatic; mostly sapro- 

 phytic ; forming zoospores in zoospor- 



Family 6. Monoblepharidaceae. Aquatic sapro- 

 phytes; antherids producing unicili- 

 ated sperms. Monoblepharis. 



Family 7. Saprolegniaceae. Water Molds. Aquatic, 

 parasitic or saprophytic; antherids 

 not producing sperms. Saprolegnia, 

 Achlya. 



Family 8. Pythiaceae; 9, Cladochytriaceae; 10, An- 



cylistaceae. 



Order PERONOSPORALES. Non-aquatic; mostly parasitic 

 in the tissues of higher plants; usually 

 forming zoospores in conidia. 



Family 11. Albuginaceae. White Rusts. Conidia in 

 chains. Albugo. 



Family 12. Peronosporaceae, Downy Mildews. 

 Conidia terminal singly on branched 

 conidiophores. Phytophthora, Plas- 

 mopara, Peronospora. 



Order MUCORALES. Typically non-aquatic; saprophytic, 

 or parasitic on other fungi; not form- 

 ing zoospores; spores single, clustered, 

 or in sporangia. 



Family 13. Mucoraceae, Black Molds. Sporangium 

 with a columella. Rhizopus, Mucor, 

 Pilobolus. 



Family 14. Mortierellaceae. Sporangium without a 

 columella. Mortierella. 



Family 15. Chaetocladiaceae. Spores single, or clus- 

 tered on branched conidiophores. 

 Chaetocladium. 



Family 16. Piptocephalidaceae. Spores in chains, 

 clustered on the ends of branches. 

 Piptocephalis, Syncephalis. 



