CHYTRIDIALES 153 



by 6 [x in diameter, the long axis parallel with that of the alga, with 

 rounded ends, one of which bears a slightly bent spinelike prolongation 

 4.5 [i long, wall thin, smooth, colorless, discharge tube narrow, slightly 

 prolonged beyond the algal wall, arising from the middle or end of 

 the sporangium; other characters unknown. 



In Closterium sp., coll. Massart, Norway. 



Observed only in fixed material of the desmid. The peculiar spine- 

 like process may in reality be the axis of a rhizoidal system the re- 

 mainder of which has been dissolved by the fixing solution. The or- 

 ganism strongly resembles Mitochytridium. 



? Olpidium sorokinei de Wildeman 



Bull. Soc. Roy. Bot. Belg. (Mem), 35: 16. 1896 



Olpidiopsis sorokinei de Wildeman, Ann. Soc. Beige Micro. (Mem.), 

 14: 22, fig. 7. 1890. 



Sporangium narrowly tubular or somewhat saccate, its long axis 

 parallel with that of the algal cell, with a short sessile lateral discharge 

 tube, wall thin, smooth; zoospores very small, movement rapic, flagel- 

 lation not observed; resting spore not observed. 



In Tribonema bombycina, Belgium. 



Empty sporangia exactly like those figured by de Wildeman have 

 been found in Tribonema bombycina in Michigan. They were accom- 

 panied by a resting stage essentially like that in Olpidiopsis oedogo- 

 niarum and it is possible that de Wildeman's fungus is really a species 

 of that genus. He separated it from Olpidiopsis fusiforme var. oedo- 

 goniarum {O. oedogoniarum) chiefly on the basis of difference in host 

 plants. 



? Olpidium spirogyrae Skvortzow 

 Arch. Protistenk., 51 : 429, text fig. 1. 1925 



Sporangium ellipsoidal, with a smooth somewhat stout colorless 

 wall, 33.3-34 [j. long by 14.8-15 \i broad, bearing a more or less pro- 

 jecting discharge tube, 7.4-9.2 \x long by 3.7-5 \x broad, which is 

 swollen beneath the host wall, forming a bulblike expansion 3.7 \x 

 wide, and is constricted where it arises from the sporangium; other 

 characters not observed. 



In Spirogyra inflata, Manchuria. 



