128 AQUATIC PHYCOMYCETES 



In the lorica of Trachelomonas teres var. glabra, T. swirenkoi, Man- 

 churia. 



Observations on the flagellation of the zoospores will be necessary 

 before it can be said whether this is a species of Sphaerita or Pseudo- 



sphaerita. 



? Sphaerita sp. 



Karling (1941a) listed an unnamed species of this genus in Euglena 

 in the United States. A Sphaerita sp. has also been reported from Czecho- 

 slovakia as parasitic in Gonyostomum semen (Chloromonadineae) by 

 Fott (1952). 



OLPID1UM (Braun) Rabenhorst 



Flora Europaea algarum, 3: 288. 1868 (sensu recent. Schroeter. 

 Kryptogamenfl. Schlesien, 3 (1): 180. 1885) 



(Figs. 12D, p. 124; 4 A, p. 72) 

 Chytridium, subgen. Olpidium Braun, Abhandl. Berlin Akad., 1855: 75. 



1856. 

 Cyphidium Magnus, Wissensch. Meeresunters. Abt. Kiel, 2-3: 77. 1875. 

 Olpic/iella Lagerheim, Journ. de Botanique, 2: 438. 1888. 

 Endolpidium de Wildeman, Ann. Soc. Beige Micro (Mem.), 18: 153. 1894. 



Thallus soon becoming walled, endobiotic, holocarpic, without rhi- 

 zoids, not entirely filling the cell of the substratum, forming either a 

 sporangium or a resting spore; sporangium inoperculate, predom- 

 inantly spherical or ellipsoidal, smooth-walled, usually forming a single 

 discharge tube (sometimes several) of variable length, the tip, at 

 least, extramatrical; zoospores formed within the sporangium, poste- 

 riorly uniflagellate, usually with a single globule, discharged through 

 a pore formed upon the deliquescence or rupturing of the tip of 

 the discharge tube; resting spore thick-walled, generally with a large 

 globule, borne like the sporangium, formed in some instances (all?) 

 from a planozygote produced by the fusion of isogamous planogametes, 

 upon germination forming zoospores. 



The genus includes forms parasitic primarily in fresh-water algae, 

 flowering plants, spores, moss protonema (Petersen, 1910; Skvortzow, 

 1927), and aquatic microscopic animals. 



Braun's subgenus, raised to generic rank by Rabenhorst, included 



