LAGENIDIALES 955 



?Olpidiopsis sorokinei de Wildeman 

 Ann. Soc. Beige Micro. (Mem.), 14:22, fig. 7. 1890 

 Olpidium sorokinei de Wildeman, Bull. Soc. Roy. Bot. Belg. (Mem.,) 35: 16. 



1896. 

 Empty sporangia, only. 

 In Tribonema bombycina, Belgium. 



EXCLUDED SPECIES OF OLPIDIOPSIS 



*Olpidiopsis longicollis Zopf, nom. nudem 



Schenk, Handbuch d. Bot ; 4: 508. 1890 



This name was applied to an incompletely observed parasite in the 

 zoocyst of Vampyrella spirogyrae figured by Zopf (1888: 351, pi. 19, 

 fig. 14). 



GENUS OF THE OLPIDIOPSIDACEAE OF DOUBTFUL STATUS 



7PSEUDOLPIDIUM A.Fischer 

 Rabenhorst Kryptogamen-Fl., 1(4): 33. 1892 



Olpidiopsis sensu Fischer, Jahrb. wiss. Bot., 13: 363. 1882. Non Cornu. 



Thallus endobiotic, holocarpic, without a specialized vegetative sys- 

 tem, at first naked and somewhat amoeboid, later walled, predomi- 

 nantly spherical or ellipsoidal, forming the rudiment of the sporangium ; 

 sporangium smooth-walled, with from one to several discharge tubes, 

 zoospores laterally biflagellate, produced in the sporangium; resting 

 spore unknown. 



Parasitic in algae. 



The present status of this genus has been discussed above (see p. 927). 

 As it now stands the genus is simply a dumping ground for three 

 incompletely known species. Karling ( 1 942e : 54) suggests that Pseudol- 

 pidium deformans may be referable to Rozellopsis or Woronina. McLarty 

 (1941a) and Shanor (1939b) believe the other two will eventually be 

 recognized as species of Olpidiopsis. 



KEY TO THE SPECIES OF PSEUDOLPIDIUM 



Thallus fragmenting; parasitic in Drapamaldia P. deformans, p. 956 



Thallus not fragmenting 



Parasitic in Glenodinium P. glenodinianum, p. 956 



Parasitic in Sphaerita P- sphaeritae, p. 956 



