526 AQUATIC PHYCOMYCETES 



On Cladophora japonica (marine), Japan. 



Considered possibly distinct from Chytridium lagenaria because its 

 habitat is marine. 



Chytridium codicola Zeller 

 Publ. Puget Sound Biol. Station, 2: 121. pi. 20, figs. 5-7. 1918 



Sporangium erect, sessile, globose to ovoid, 20-34 u. in diameter, wall 

 smooth, colorless; rhizoid broad, often swollen or vesiculate, or consist- 

 ing of two lobelike saccate branches; zoospores spherical, 3-4 jj. in 

 diameter, with a single refractive colorless globule and a long flagellum, 

 escaping through an apical or slightly subapical circular exit pore, 6-8 fj. 

 in diameter, formed upon the dehiscence of an operculum which does 

 not interrupt the even contour of the sporangium; resting spore not 

 observed. (Modified from Zeller.) 



On Codium mucronatwn, United States (Pacific Coast). 



Chytridium polysiphoniae Cohn 



Hedwisia, 4: 169. 1865; Schultze, Archiv mikro. Anat., 3:40, pi. 2, fig. 2. 



1867 



(Fig. 31 N-P, p. 496) 



Rhizophydium polysiphoniae (Cohn) H. E. Petersen, Oversigt Kgl. Danske 



Vidensk. Selskabs. Forhandl., 1905 (5): 486, fig. XI, 5-8. 

 Rhizophydium olla H. E. Petersen, op. cit., p. 485, fig. XI, 4. 



Sporangium sessile, subspherical, subangular, pyriform, or urceolate, 

 12-33 u. in diameter by 12-42 [i high, resting with its broad base on 

 the substratum, wall fairly stout, colorless, yellowish, or dark, not of cell- 

 ulose, smooth or densely punctate; rhizoids unbranched or branched; 

 zoospores spherical, 2.5-4 (jl in diameter, with a colorless centric or 

 eccentric globule and a fairly long flagellum, escaping upon the dehis- 

 cence of an apical smooth convex operculum 7-13 y. in diameter; resting 

 spore not observed. 



On Polysiphonia violacea, Cohn (loc. cit.), Germany; Polysiphonia 

 violacea, P. urceolata, coll. Rosenvinge, Petersen {loc. cit.), Ceramium 



