836 



AQUATIC PHYCOMYCETES 



Fig. 65. Saprolegniaceae 



A-B. Leptolegnia eccentrica Coker: A, sporangium; B, oogonium with 

 mature oospore and androgynous antheridium. C. Pythiopsis humphreyana 

 Coker, globular sporangia. D-E. Saprolegnia ferax (Gruith.) Thuret: D, 

 proliferating sporangium; E, sex organs. F-G. Ac/ilya americana Humphrey: 

 F, sex organs; G, sporangium. H-I, Isoachlya unispora Coker and Couch: 

 H, sporangia renewed as in Achlya; I, oogonia in chain. J-K. Thraustotheca 

 clavata (de Bary) Humphrey: /, encysted spores within sporangium; K, sex 

 organs. L-M. Dictyuchus monosporus: L, zoospores escaping through wall 

 of sporangium; M, sex organs. N-O. Brevilegnia unisperma var. delica Coker: 

 N, unwalled sporangium with spores dispersing; O, apogamous oogonium 



