402 AQUATIC PHYCOMYCETES 



sporangium inoperculate, terminal, separated by a cross wall from the 

 vegetative part of the thallus, with or without one or more discharge 

 tubes; zoospores posteriorly uniflagellate, with a single globule, escaping 

 after the deliquescence of one or more papillae; resting spore not 

 observed. 



On Oedogonium. 



Fischer, who put the genus in the Hyphochytriaceae, considered it 

 too poorly known to place taxonomically, and in this Minden concurred. 

 It seems likely that the presence of a septate "mycelium" bearing a 

 zoosporangium which formed posteriorly uniflagellate zoospores was 

 too bizarre to be acceptable to these monographers. The genus, though 

 unusual, is adequately described and leaves no doubt as to just what 

 type of organism Sorokin saw. A somewhat similar thallus is found in 

 Coenomyces (p. 479). 



Aphanistis oedogoniorum Sorokin 



Arch. Bot. Nord France, 2: 35, fig. 43 a-d. 1883 (separate) 1 



(Fig. 24 A-B, p. 396) 



Sporangium formed only in the oogonium of the alga, at first ovoid, 

 later nearly spherical, with one or two (opposite) apical papillae which 

 may be formed on more or less prolonged discharge tubes that are 

 pointed toward the oogonial opening; vegetative system isodiametric, 

 simple or branched, the septations occurring at relatively long intervals; 

 resting stage not observed. 



In filaments and oogonia of Oedogonium sp., Asiatic Russia, 

 European Russia. 



As in Rhizophydium decipiens, the fertilization pore of the oogonium 

 was utilized for the setting free of the zoospores of the fungus into the 

 outside medium. 



IMPERFECTLY KNOWN SPECIES OF APHANISTIS 



? Aphanistis (?) pellucida Sorokin 

 Arch. Bot. Nord France, 2: 36, fig. 44. 1883 (separate) 2 



1 See also Revue Mycologique, 11: 137, pi. 79, figs. 79-83, 85. 1889. 



2 Ibid., fig. 84. 1889. 



