726 AQUATIC PHYCOMYCETES 



In soil, hempseed bait, Sparrow (be. cit.), Johns (comm.) (North 

 Carolina), T. W. Johnson, Jr. (comm.), (Mississippi), United States. 



No antheridia have ever been found in this species although the 

 possibility of their occurrence cannot be disregarded. Apparently, the 

 oospores are typically parthenogenetic. 



MONOBLEPHARIDACEAE 



Mycelium lacking pseudosepta; zoosporangia always elongate; gam- 

 etangia not proliferous; oogonium typically forming a single oosphere, 

 the entire male gamete engulfed by the female at fertilization, female 

 gamete converted without an intervening swarm period into a 

 usually bullate oospore which remains in intimate contact with the 

 oogonium. 



One genus, Monoblepharis. 



Saprophytic primarily on twigs in cool, clear water. 



MONOBLEPHARIS Cornu 



Bull. Soc. Bot. France, 18: 59. 1871 

 (Figs. 48-50, pp. 700, 704, 708; 53, p. 730; 54 A, E, p. 738) 



Diblepharis Lagerheim, Bih. Klg. Svensk. Vetensk.-Ak. Handl., 25, Afd. 3, 



No. 8:39. 1900. 

 Monoblephariopsis Laibach, Jahrb. wiss. Bot., 66: 603. 1927. 



Mycelium nonseptate, branched or unbranched, colorless or with a 

 slightly brownish tinge, attached by rhizoids to the substratum, contents 

 of the hyphae disposed in a reticulate or foamy manner; zoosporangia 

 usually terminal, narrowly cylindrical or somewhat irregular in shape, 

 cut off from the hyphae by cross walls, renewed by branching of the 

 hyphae or by internal proliferation; zoospores fully formed within the 

 sporangium, escaping after the dissolution of its apex, posteriorly uni- 

 flagellate; oogonia intercalary or terminal, usually narrowly pyriform 

 to spherical, cut off from the attendant hyphae by cross walls, each 

 oogonium exhibiting upon maturity a well-defined receptive papilla and 

 a single egg; antheridia of differing shapes, usually somewhat cylindrical, 

 variously placed, forming a small number of uniflagellate sperms entirely 

 similar, save for their smaller size, to the zoospores; oospheres after 



