948 AQUATIC PHYCOMYCETES 



ellipsoidal, 19-24 \x long, with a smooth, thickened brownish or color- 

 less wall and a large globule in the contents, upon germination producing 

 a discharge tube and functioning as a sporangium; companion cells 

 from one to four, sessile or attached by a short beak, spherical, 10-16.6 

 [i in diameter, smaller than the resting spore, thin-walled, smooth, 

 colorless. 



Often in company with other parasites in vegetative cells, gametangia, 

 and, rarely, zygospores of Mougeotia sp., Spirogyra sp., Zopf (loc. cit.), 

 Fisch (loc. cit.), Minden (loc. cit.), Germany; Spirogyra sp., de Wilde- 

 man (1890: 24; 1896b: 31, pi. 2, figs. 1-12, 15-17), coll. Marchal, de 

 Wildeman (1890, 1896b [Luxembourg]), Belgium; Spirogyra sp., Con- 

 stantineanu(1901 : 375), Rumania ;Spirogyra sp., E. J. Butler (1907: 135, 

 pi. 10, figs. 1 1-13), India; Spirogyra sp., Mougeotia sp., Scherffel (1925a: 

 104, pi. 4, figs. 191-198), Krenner (1935), Domjan (1936: 52, pl.l, figs. 

 172-173, 182-184), Spirogyra sp., Berczi (1940:80), Hungary; Spi- 

 rogyra sp., Karling (1942e: 50), Spirogyra sp., Sparrow and Ellison 

 (1949: 31, figs. A-G), United States; Spirogyra sp., Shen and Siang 

 (1948:200, fig. 11), China. 



On the basis of the reports of Fisch, de Wildeman, and Scherffel, the 

 fungus is strongly nucleophagous. 



Zopfs seemingly incorrect observations on the flagellation of the 

 zoospore led Minden to erect the genus Pseudolpidiopsis (now in synon- 

 ymy) for the disposition of this species. The affinities of Tokunaga's 

 (1933b: 82, pi. 5, fig. 13) fungus from Japan are doubtful, since the 

 zoospores are said to be uniflagellate. The American material examined 

 by Sparrow and Ellison (loc. cit.) was parasitized by a species of 

 Pythiella (p. 814). 



Olpidiopsis oedogoniarum (de Wild.) Scherffel 

 Arch. Protistenk., 52: 103, pi. 4, figs. 199-207c, pi. 5, figs. 207d-208. 1925 



Olpidiopsis fusiformis var. oedogoniarum Sorokin, Arch. Bot. Nord France, 



2:30, fig. 31. 1883 (separate). 1 

 Olpidium oedogoniarum (Sorok.) de Wildeman, Ann. Soc. Beige Micro. 



(Mem.), 18: 154, pi. 6, figs. 9-10. 1894. 



Sporangium lying free in the host cell, elongate, ovoid, saclike, broadly 

 1 See also Sorokin, Revue Mycologique, 1 1 : 84, pi. 80, fig. 99. 1889. 



