CHYTRIDIALES Ml 



paper. From the figure he gives, an endooperculum is evidently formed 

 in the sporangium. Zopf conjectured that flagellate zoospores may 

 sometimes be formed. In addition to Amoebochytrium, nonflagellate 

 spores have also been reported for Sporophlyctis rostrata and Sporo- 

 phlyctidium africanum of the Rhizidiaceae. 



Amoebochytrium rhizidioides Zopf 

 Nova Acta Acad. Leop.-Caro'., 47: 181, pi. 17, fig-. 1-13. 1884 



Sporangia relatively large, pyriform, basally apophysate with a more 

 or less prolonged discharge tube which after disarticulation generally 

 bears a short remnant of the concomitant rhizoid distally beyond the 

 cross wall (endooperculum?), wall stout, smooth, cuticularized, brown- 

 ish; rhizoidal system extensive, branched, with occasional intercalary 

 fusiform swellings; zoospores large, ovoid, with a large refractive yellow- 

 ish globule, discharged through a pore formed in the cross wall which 

 terminates the tubelike prolongation of the sporangium, movement 

 strongly amoeboid; resting spores not observed. 



Saprophytic in the gelatinous matrix of colonies of Chaetophora 

 elegans, growing between the radiating algal branches, Zopf {loc. cit.), 

 from soil, substrata?, Harder (1948: 6), Germany. 



POLYCHYTRIUM Ajello 



Mycologia, 34: 442. 1942 

 (Figs. 9, p. 102; 30 H, p. 474) 



"Rhizomycelium intra- and extramatrical, extensive, coarse, branch- 

 ed, occasionally septate with rhizoids, conspicuous spindle organs or 

 swellings lacking. Zoosporangia non-operculate, terminal and inter- 

 calary, variously shaped, spherical, clavate or pyriform. Zoospores 

 posteriorly uniflagellate, emerging fully formed in a globular mass and 

 remaining quiescent for a few moments before swimming away" (Ajello, 

 loc. cit.). 



A monotypic genus; saprophytic on vegetable and chitinous debris 

 in bogs. 



The diagnosis, quoted directly from Ajello, does not contain the most 



