14o AQUATIC PHYCOMYCETES 



Olpidium rotiferum Karling 

 Lloydia, 9: 6, pi. 1, figs. 19-34. 1946 



"Sporangia gregarious, up to 15 in a cell, hyaline, smooth, pre- 

 dominantly pyriform, 12-40 x 20-70 u, oval, 10-20 x 15-35 ja, sub- 

 spherical 1 5—30 jj., with one short broad, 4-6 x 5-12 [x exit tube. Zo- 

 ospores swarming in sporangium before emerging; later forming a 

 globular mass at exit orifice; oblong, 3-3.5 x 6.5-7 jx, with one or 

 two small lateral, elongate refractive bodies; flagellum 12-14 jjl long. 

 Resting spores hyaline, smooth, oval, 12-14 x 15-17 ;x, spherical, 

 10—1 5 jx; germination unknown" (Karling, he. cit.). 



Parasitic in eggs and adults of rotifers, most commonly in the adult 

 bodies, Brazil. 



Olpidium vampyrellae Scherffel 

 Arch. Protistenk. 54: 168, pi. 9, figs. 2-5. 1926 



Sporangium spherical or broadly ovoid, colorless, 10-12 a in diam- 

 eter or 12 13 by 14-15 jx, with a short papilla-like refractive dis- 

 charge tube 3-4 jx long by 2 a wide which bores through the host 

 wall; contents of the sporangium during maturation bearing small 

 contractile vacuoles and exhibiting a slight amoeboid movement; zo- 

 ospores moving in the sporangium before escape, discharged with the 

 watery content of the tube upon the dissolution of its tip, each spore 

 rest mil: a moment at the tip of the sporangium before swimming away, 

 body somewhat ovoid, 3 by 2 u., with dense shining contents nearly 

 free o\' granules and without an oil drop, with a single posterior flagel- 

 lum: resting spore not observed. 



In zoocysts of Vampyrella, Hungary. 



\lthough forming contractile vacuoles and lacking an oil globule 

 in the zoospore the organism is believed by Scherffel to be a species 

 el' Olpidium rather than a monad. 



Olpidium pseudosporearum Scherffel 

 Arch. Protistenk., 54: 170, pi. 9, figs. 6-7. 1926 

 Sporangia ovoid or somewhat irregular, becoming rather tubular 

 if several occur in a cell, usually 12 u. long by 9 u. in diameter, varying 



