136 



I Q UA TIC PH YCO M YCETES 



pi. 39, figs. 5 7). Sweden; Cladophora sp., Litvinow (1953: 75), Lat- 

 \i\: Closterium, Kohayashi and Ookubo (1954b: 573, fig. 15), Japan; 

 Spirogyra sp., Lacy (1955:209), India. 



All forms with a spherical, ellipsoidal, ovoid, or somewhat pyri- 



FlG. 13. Olpidium 



A. Olpidium entophytum (Braun) Rabenhorst, discharged sporangium in 

 Cladophora. B. Olpidium utriculiforme Scherffel, empty sporangium in Cos- 

 marium. C Olpidium saccatum Sorokin, empty sporangia in semicell of 

 Cosmarium. D. Olpidium hyalothecae Scherffel, zoosporangium and spiny 

 resting spore in cells of Hyalotheca. E. Olpidium euglenae Dangeard, dis- 

 charging sporangium in Euglena cyst. F-G. Olpidium gregarium (Nowak.) 

 Schroder in rotifer eggs: F, single sporangium with discharge papilla pro- 

 truding through wall of egg case; G, empty and discharging sporangia and 

 resting spores. 



I I. / G, Sparrow, 1936a; B-C, Scherffel, 1926a; D, after Scherffel, 1926a; 

 E, Dangeard, 1894-95b) 



form sporangium and an isodiametric discharge tube of variable length 

 which inhabit green algae arc included in this species. Cross-inoculation 

 experiments may in the future show the species as now understood 

 ii> be a collective one. 



The fungus on Aegagrophila reported by Tokunaga (1933b: 79), 

 tentatively placed here, forms sporangia ranging from 19.2-62.4 u. in 

 diameter: the discharge tube is broad, attaining a diameter of 9.6 u,. 



