CHYTRIDIALES 175 



with one to three exit papillae; wall of sporangium usually indistin- 

 guishable from that of host cell. Zoospores obclavate, 3.3 -5 \l x 

 1.8-2 [i, aguttulate; rarely bi- and multiflagellate as the result of un- 

 equal cleavage; flagellum 14 \x long; emerging fully formed in a stream 

 from the exit papillae and becoming actively motile in a few seconds. 

 Resting spores faintly yellow, oval, spherical, 8-22 \x, with a large 

 central vacuole and coarsely granular cytoplasm; wall 1-1.8 ^ thick, 

 smooth or spiny, spines 1.5-3 \x long; transformed directly into a zo- 

 osporangium in germination and forming zoospores" (Karling, 1942b: 

 200). 



Parasitic in Nowakowskiel/a profusion, N. elegcms, N. ramosum, C/a- 

 dochytrium replication, C. crassum, and C. hyalinum, Karling {he. cit.; 

 1948c: 508), Septochytrium macrosporum, Karling (1942c: 621), United 

 States; Cladochytrium replieatum, Karling (1944f: 643), Brazil. 



An extensive account of the structure and reproduction of this spe- 

 cies has been given by Karling (1942a: 25, figs. 1 24). Originally dis- 

 covered in Nouakowskiel/a profusion, it was induced to infect most 

 of the other fungi noted above. It was found to cause slight to marked 

 hypertrophy. 



Rozella pseudomorpha (Scherffel) Sparrow 



Aquatic Phycomycetes, p. 124. 1943 



Olpidium (?) pseudomorphum Scherffel, Arch. Protistenk., 54: 510, pi. 28, 

 figs. 1-5. 1926. 



Sporangium filling the vegetative cell of the host, and hence as- 

 suming its shape and size, forming a fairly stout tapering discharge 

 tube; zoospores narrowly ellipsoidal, ovoid, or plump and rodlike, 

 somewhat arched, with from three to five refractive granules, flagel- 

 lum fairly long, trailing, attached at the concave side of the body, 

 zoospores emerging individually from the discharge tube and remain- 

 ing for a time near the orifice undergoing amoeboid change of shape, 

 movement hopping; resting spore unknown. 



Parasitic in vegetative cells of Lagenidium rabenhorstii, Hungary. 



A fungus also considered to be this species was found by Scherffel 

 (loc . cit.) in vegetative cells of Myzocytium proliferum. It differed from 



