CHYTRIDIALES 147 



in size according to the number occupying a single zoocyst, wall 

 thin, colorless, smooth; plasma whitish, gleaming, with numerous 

 minute oil droplets; discharge tube short, papilla-like, penetrating the 

 host wall; zoospores very numerous, small, spherical, with an eccentric 

 minute (1 \x) oil droplet and a very long posterior flagellum, movement 

 hopping, gliding; resting spore not observed. 



In zoocysts of Pseudosporopsis bacillariacearum (?) and Pseudospora 

 parasitica (?), Hungary. 



Zopf (1888: 351) also mentions an Olpidium in the zoocyst of Pseudo- 

 spora. This fungus, however, formed a long discharge tube, thus differ- 

 ing from the present species. O. pseudosporeanmi differs from O. 

 vampyrellae in that the zoospore possesses a globule. Furthermore, 

 the sporangium has a less prominent discharge tube. Scherffe 1 has not 

 distinguished this species from O. difflugiae. 



Olpidium nematodeae Skvortzow 

 Arch. Protistenk., 57: 204, fig. 1. 1927 



Sporangia occurring singly or in linear series, spherical, 15-35 [x 

 in diameter, with a smooth thin wall, discharge tube narrowly cylin- 

 drical, 100-180 [x long by 1 \x in diameter, extending beyond the host 

 wall; zoospores uniflagellate; resting spore 25-32 u. in diameter, wall 

 smooth, 5 \x thick, of two layers. 



In nematodes, Skvortzow (loc. cit.), Manchuria; cysts of Hetero- 

 dera schactii, Rozsypal (1934:413, pi. 2, figs. 72-79), Germany. 



RECENTLY DESCRIBED TAXON * 



Olpidium longicollum Uebelmesser 



Arch. f. Mikrobiol., 25: 309, fig. 1. 1956. ( = Olpidium sp. Harder and 



Uebelmesser, 1955) 



Sporangium oval to round, often irregularly flattened, 50-60 \x broad 

 by 60-80 (jl long, smooth-walled, with an 80-200 u. long discharge tube; 

 contents at first finely granular, later differentiated into round zoo- 

 spores, 10 \x in diameter, with 80 \x long flagellum; resting spore spheri- 



1 Not included in the key. 



