CHYTRIDIALES 337 



Phlyctochytrium nematodeae Karling 



Lloydia, 9: 7, pi. 2, figs. 35-39. 1946 



(Fig. 18 G, p. 286) 



"Sporangia usually numerous, extramatrical, hyaline, smooth, spher- 

 ical, 16-24 [x, oval, 15-18 x 19-22 [x, rarely slightly urceolate, 10-16 

 X 18-26 (x, with one to five low exit papillae. Apophysis oval, subspher- 

 ical, 4-7 u. in diameter. Rhizoidal system richly branched. Zoospores 

 oval, 2.5-3 ;x, with a .5 to 1 \x in diameter refractive globule, and a 

 12u. long flagellum. Resting spores extramatrical, hyaline, smooth, 

 oval to spherical, 7-10 (x, with one large and several small refractive 

 globules; germination unknown" (Karling, he. cit.). 



Parasitic in eggs, cysts, and adults of nematodes, from soil, Brazil. 



Although the species behaved as a virulent parasite in the eggs, 

 Karling was not certain that it was capable of killing active adults. 



Phlyctochytrium synchytrii Kohler 

 Arb. biol. Abt. (Anst.-Reichsanst.) Berlin, 13: 382, pis. 1-2. 1924 



Sporangium sessile, usually spherical, up to 50 \x or more in diam- 

 eter, with from one to nine strongly protruding finger-like papillae, 

 wall smooth, slightly thickened, colorless; endobiotic part very thin- 

 walled, irregularly expanded or subspherical, flattened against the host 

 wall; zoospores spherical, 4 jx in diameter (occasionally 4.5 [x or more), 

 with one or several minute eccentric oil droplets and a flagellum 20-25 \x 

 long, discharged through the nearly sessile circular pores 4 jx in diam- 

 eter formed upon the deliquescence of the papillae; resting spore epi- 

 biotic, spherical (?), 14 [x in diameter, colorless, with a roughened outer 

 wall, upon germination forming a spherical sporangium 9 [x in diameter. 



Parasitic on resting sporangia of Synchytrium endobioticum, Ger- 

 many. 



Profuse development of sporangia of the parasite occurred when the 

 host sporangia were spread out on moist gypsum blocks. 



Phlyctochytrium marinum Kobayasi and Ookubo 

 Bull. Nat. Sci. Mus. (Tokyo), 33: 55, fig. 2. 1953 

 Zoosporangia scattered, epibiotic, sessile, ellipsoidal, pyriform or 



