1 52 AQUA TIC PH YCOM YCETES 



? Olpidium (?) mesocarpi de Wildeman 

 Ann. Soc. Beige Micro. (Mem.), 20: 45, pi. 1, figs. 13-16. 1896 



Sporangium smooth, ellipsoidal, more or less elongate, about 10 [j. 

 in diameter by 20-28 jj. long, single, sometimes two sporangia in one 

 cell o\' the host and then occupying all the width of the filament, dis- 

 charge tube lacking, the papilla which perforates the algal wall forming 

 upon its deliquescence a circular opening in the wall for the escape of 

 the zoospores; zoospores and resting spore unknown. 



In Mougeotia (" Mesocarpus'''') sp., Belgium. 



Differing from most species of the genus in sometimes filling the 

 host cell and in not forming a discharge tube. In these respects it 

 resembles a Rozclla. 



? Olpidium mougeotia Skvortzow 

 Arch. Protistenk., 51 : 430, fig. 2. 1925 



Sporangium spherical, 1 1-14.8 fx in diameter, with a short straight 

 isodiametric discharge tube 5.7-6 jx long, the tip of which does not 

 project beyond the outer surface of the algal wall; other characters 

 unknown. 



On Mougeotia scalar is, Manchuria. 



? Olpidium pusillum (Sorokin) de Wildeman 

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



Chy iridium pusillum Sorokin, Arch. Bot. Nord. France, 2: 24, fig. 23. 

 1883 (separate) '. Non C. pusillum Scherffel, Arch. Protistenk., 73: 143. 

 1931. 



Sporangium spherical, 4.5 ix in diameter, with a very short sessile 



discharge tube, wall thin, smooth, colorless; other characters unknown. 



In cells of Oedogonium sp., European Russia, Asiatic Russia. 



? Olpidium rostratum de Wildeman 



la Notarisia, 10 (3): 35. 1895; Ann. Soc. Beige Micro. (Mem.), 20: 40, 



fig. 1. 1896 



Sporangium narrowly ellipsoidal or somewhat tubular, 28-40 ix long 

 1 Ibid., 82, pi. 80, figs. 112-113. 1889. 



