956 AQUATIC PHYCOMYCETES 



? PSEUDOLPIDIUM DEFORMANS SerbillOW 



Scripta Bot. Horti Univ. Imper. Petro., 24: 154, pi. 1, figs. 1-12, pi. 4, fig. 



16-28. 1907 



Thallus at first naked, amoeboid, dividing into several parts; spo- 

 rangium spherical, up to 35 [jl in diameter, or long-ovoid, 30.5-47.5 u. 

 long by 14.5-27 u, wide, from one to eleven in the swollen host cell, 

 discharge tube cylindrical, up to 15.8 \x long by 8 [j. in diameter; zoo- 

 spores spherical or ovoid, 3.2-4.8 [jl in diameter, with two laterally 

 attached flagella, strongly metabolic (amoeboid?), without (?) an oil 

 droplet, swimming away immediately after discharge. 



Parasitic in lateral branch cells of Drapamaklia glomerata, Russia. 



Although strongly resembling a species of Olpidiopsis this fungus 

 differs in the fragmentation of the thallus. It is possible that Serbinow 

 confused multiple infection with fragmentation. The figures given afford 

 evidence for both interpretations. The zoospores are said to be without 

 an oil droplet, but this structure is clearly shown in the figures. 



? Pseudolpidium glenodinianum (Dang.) Fischer 

 Rabenhorst. Kryptogamen-Fl., 1 (4): 36. 1892 



Olpidium glenodinianum Dangeard, Journ. de Botanique, 2: 131, pi. 5, figs. 

 6-10. 1888. 



Sporangium spherical or ellipsoidal, wall thin, smooth, colorless, 

 discharge tube a more or less elongate papilla which pierces the host 

 wall; zoospores about one hundred, spherical, sometimes elongate, 

 laterally biflagellate, with a single globule, discharged in a mass im- 

 bedded in mucus and forming for a few seconds a group at the orifice; 

 resting spore not observed. 



Parasitic in Glenodinium cinctum, France. 



? Pseudolpidium sphaeritae (Dang.) Fischer 



Rabenhorst. Kryptogamen-Fl., 1(4): 36. 1892 



Olpidium sphaeritae Dangeard, Le Botaniste, 1: 51, pi. 3, figs. 3-7. 1889. 



Sporangium ovoid to somewhat pyriform, wall thin, smooth, color- 

 less, with a long discharge tube which pierces the wall of the cyst; zoo- 



