1002 



AQUATIC PHYCOMYCETES 



papillate, contents with a large globule, germination not observed. 



In Closterium rostratum (and C. striolatum?), de Wildeman (loc. cit.), 

 Belgium; parasitic in Closterium sp., Cejp (1933a: 7, pi. 1, figs. 17-18, 

 pi. 2, fig. 4), Czechoslovakia; Closterium sp., Couch (1935b: 381, figs. 

 35-38), Closterium setiferum Karling (1949a: 275). Closterium sp., 

 Sparrow and Barr (1955:556), United States; Closterium sp., H. E. 

 Petersen (1909: 402; 1910: 537), Denmark. 



As Couch has pointed out, before the sporangia are delimited the 



Fig. 81. Lagenidium 



A. Lagenidium cntophytum (Pringsheim) Zopf in zygospore of Spirogyra, 

 zygospore cleared to show contorted thallus; extramatrical discharge tubes 

 and two resting spores may be seen. B. Lagenidium marchalianum de Wildeman 

 in Oedogonium, portion of filament showing sex organs, and empty cylindrical 

 zoosporangia each with discharge tube. C. Lagenidium closterii de Wildeman 

 in Closterium, portion of host cell showing cylindrical empty sporangia and 

 one sporangium forming its zoospores in a vesicle at orifice of discharge tube. 

 D. Lagenidium rabenhorstii Zopf in Spirogyra, empty sporangia and monoe- 

 cious sex organs. 



{A, D, Zopf, 1884; B-C, Couch, 1935b) 



