950 AQUATIC PHYCOMYCETES 



large central vacuole, are given by Scherffel. His account of the degrees 

 of diplanetism exhibited by the zoospores has been mentioned in the 

 discussion of the genus (see p. 928). 



Olpidiopsis fibrillosa de Wildeman 



La Notarisia, 10 (3): 34. 1895; Ann. Soc. Beige Micro. (Mem.), 20: 28, pi. 2, 



figs. 13-14, 18-19. 1896 



(?) Pseudolpidiopsis fibrillosa (de Wild.) Minden, Kryptogamenfl. Mark 

 Brandenburg, 5:259. 1911 (1915). 



Sporangium spherical or ellipsoidal; zoospores not observed; resting 

 spore spherical or ellipsoidal, 20-25 [i in diameter (?), wall thick, densely 

 covered with long delicate radiating fibrils, germination not observed; 

 companion cells one or several, spherical, 12 [jl in diameter, with a thin 

 smooth colorless wall. 



In Spirogyra sp., coll. Massart, de Wildeman (loc. cit.), Belgium 

 (Luxembourg); Spirogyra longata, Domjan (1936:41, pi. 1, figs. 1-2, 

 24, 36), Hungary. 



The resting spores figured by Domjan have much larger fibrils than 

 those shown by de Wildeman, and one appears to lack a companion cell. 



Olpidiopsis appendiculata de Wildeman 



La Notarisia, 10 (3): 34. 1895; Ann. Soc. Beige Micro. (Mem.), 20: 30, pi. 1, 



figs. 4, 8-12. 1896 



(?) Pseudolpidiopsis appendiculata (de Wild.) Minden, Kryptogamenfl. Mark 

 Brandenburg, 5: 259. 1911 (1915). 



Sporangium spherical or ellipsoidal, with a smooth thin colorless 

 wall and a single short discharge tube, causing swelling of the infected 

 cell; zoospores not observed; resting spore spherical, 9-15 ;x in diameter, 

 thick-walled, the outer surface moderately covered with sharp spines 

 3-10 [jl long, germination not observed; companion cell vermiform, 

 20 jo. long, with a thin smooth colorless wall, proximal part expand- 

 ed. 



In Mougeotia sp., France (?) ("Beloeil"). 



