LAG EN IDl ALES 979 



Myzocytium vermicola (Zopf) Fischer 



Rabenhorst. Kryptogamen-Fl., 1(4): 75. 1892 



(Fig. 79 H, p. 977) 



Myzocytium proliferum var. vermicolum Zopf, Nova Acta Acad. Leop.- 

 Carol., 47: 167, pi. 14, figs. 35-37. 1884. 



Sporangia up to twelve in the host, somewhat broadly pyriform, 

 oblong, or more or less spherical, the septa narrow, with one, occasion- 

 ally two, short broadly conical discharge tubes protruding for a short 

 distance beyond the host wall; zoospores discharged in a quickly 

 evanescent vesicle at the tip of the discharge tube; oogonia pyriform or 

 ellipsoidal; oospore ellipsoidal or spherical, colorless, not filling the 

 oogonium; antheridium smaller than the oogonium, narrow, somewhat 

 oblong, with a delicate cylindrical penetration tube. 



Parasitic in Anguillula, Zopf (loc. cit.), Germany; Dangeard (1903b: 

 207, pis. 2-5), France; Valkanov (1931a: 365), Bulgaria. 



One-celled thalli were occasionally produced which became trans- 

 formed into a single sporangium. Fischer {loc. cit.) believes, as does 

 Karling (1942e), that Bicriciwn lethale Sorokin is a two-celled form of 

 this species. See, however, the remarks concerning Bicriciwn (p. 188). 



Dangeard (loc. cit.) described certain cytological details (see p. 917) 

 in this species and has observed the partial germination of the oospores. 

 The resting bodies, after several months, became multinucleate, vacuo- 

 late, and formed a germ tube. They probably then produced zoospores, 

 although this was not observed. The species is considered rare, but 

 Dangeard found that it occurred frequently in his laboratory cultures 

 of eelworms. 



Myzocytium zoophthorum Sparrow 



J. Linn. Soc. London (Bot.), 50: 461, pi. 19, figs. 1-8, 10-14. 1936 



(Fig. 79 F-G, p. 977) 



Sporangia variable in number, irregular, saclike, often lobulate, 

 5-17 (jl in diameter, of variable length, separated by narrow incon- 

 spicuous septa, discharge tube generally short and broad; zoospores 

 laterally biflagellate, 10-11 \i long by 6-7 u. wide, partly or wholly 



