126 AQUATIC PHYCOMYCETES 



Dangeard (1933) also states that the spiny resting spores described 

 (1889b: 46) for Sphaerita endogena in Euglena may actually belong 

 to S. dangeardii and that the conjugation of zoospores observed 

 (1889b: 49, pi. 3, fig. 8), later ascribed to incomplete segmentation, 

 was indeed a sexual process similar to that found in Olpidium viciae. 

 In his earlier researches Dangeard did not recognize that at least two 

 different parasites might be present in the Euglena, one with uni- 

 flagellate zoospores {Sphaerita) and another with biflagellate zoospores 

 (Pseudosphaerita). This, together with the fact that data were often 

 obtained from fixed material, has led to much confusion in distinguish- 

 ing what structures belong to a particular fungus. The following treat- 

 ment is probably only partly successful in unraveling the tangle, 

 since new observations alone can solve it. Many references to "Sphae- 

 rita' may be found in protozoological literature, but little can be got 

 from them since they ordinarily refer only to fixed and stained material. 

 See also Pseudosphaerita, page 961. 



Sphaerita dangeardii Chatton and Brodsky 



Arch. Protistenk., 17: 8. 1909 

 (Fig. 12B-C, p. 124) 



Sphaerita endogena Dangeard, pro parte (in Euglena), Ann. Sci. Nat. Bot., 



VII, 4:277, pi. 12, figs. 14-21. 1886. 



Sporangium spherical or somewhat ellipsoidal, extremely thin- 

 walled, sometimes with two oppositely placed short discharge papil- 

 lae; zoospores spherical or ovoid, 1.5-2 [z in diameter, resting for a 

 short time after discharge, movement hopping or slightly amoeboid; 

 resting spore (?) ovoid, 12 \x long by 8 (jl in diameter, with a brownish 

 spiny wall, upon germination forming a discharge papilla and func- 

 tioning as a zoosporangium.. 



Parasitic in Euglena spp., Dangeard {he. cit.; 1889b: 46, pi. 2, 

 figs. 11-19, pi. 3, figs. 1-2), France; Euglena sp., Constantineanu 

 (1901:370), Rumania; Euglena sp., Serbinow (1907: 154, pi. 5, figs. 

 4-8), Russia; Euglena viridis, Valkanov (1931a: 361), Bulgaria. 



No statement was made by Dangeard (1933) as to whether the 

 Sphaerita in Phacus and Trachelomonas is to be considered to belong 

 here or in S. endogena. Whether or not the smooth-walled resting 

 spores described in the 1886 paper belong here is apparently not known. 



