CHYTRIDIALES 261 



On Coleochaete puhinata, Braun (foe. cit.), Schroeter (1885: 190), 

 swarm spores of Stigeoclonium sp., Pringsheim (in Braun, 1856a), 

 Draparnaldia nudiuscula, Rabenhorst (1868: 280), Germany; Conferva 

 abbreviate!, Lagerheim (1884 [1]: 100), Sweden; Draparnaldia sp., 

 Dangeard ( 1 890-9 lc: 242, pi. 16, fig. 32), France; Tribonema bom- 

 bycina, de Wildeman (1890: 18), Belgium; Draparnaldia gfomerata, 

 Serbinow (1907: 158, pi. 4, figs. 29-34), Russia; "Conferva," Valkanov 

 (1931a: 362), Bulgaria; oogonia of Oedogonium sp., vegetative cells 

 of Draparnaldia sp., Couch (1932:251, pi. 15, figs. 36-39), United 

 States; Spirogyra maxima, Berczi (1940: 82, pi. 1, figs. 6, 7, 9, pi. 2, 

 fig. 12), Hungary; Ulothrix sp., Litvinow (1953:80), Latvia; Cla- 

 doplwra sp., Richards (1956: 261, pi. 6, figs. 3-5), Great Britain. 



Neither Braun nor Pringsheim observed the endobiotic system or 

 the zoospores of this species. Braun does state definitely, however, 

 that the sporangium is inoperculate. Since these essential features are 

 lacking in the original description the fungus described by Dangeard 

 (foe. cit.) (and later by Serbinow) is taken as typifying the species. 

 Schenk's fungus (1858a: 236, pi. 5, figs. 1-5), termed Chytridium mam- 

 millatum, though like Braun's in the shape of its sporangium, possesses 

 a peglike unbranched endobiotic part such as characterizes species 

 of Phlyetidium. Actual discharge of the sporangium was not observed, 

 and Schenk's fungus might well have been a Chytridium. Schenk re- 

 marks, however, that no opercula were found on the discharged spo- 

 rangia, which, incidentally, were only one half the size of those de- 

 scribed by Braun. 



The specimen figured by de Wildeman (1891 : 170, fig. 1) and tenta- 

 tively assigned to this species differs from it in having pyriform spo- 

 rangia and a small knoblike endobiotic part (see Chytridium pedicel- 

 latum, p. 534). 



The fungus of Constantineanu (1901 : 379, fig. 80), found on Spirogyra 

 in Rumania and called Chytridium mammillatum, possesses broadly 

 ovoid, subspherical, or somewhat irregular bicornate sporangia and 

 cannot be included in the present species. Further investigations may 

 show it to be new. 



Couch's fungus differs from Braun's and Dangeard's in having a 

 broader, more prominent papilla or beak, and in the rhizoidal system, 



