CHYTRIDIALES 317 



Chytridium microsporum Nowakowski, in Cohn, Beitr. Biol. Pflanzen, 



2:81, pi. 4, fig. 11. 1876. 

 Phlyctidium microsporum (Nowak.) Schroeter, Kryptogamenfl. Schlesien, 



3 (1): 190. 1885. 



Sporangium sessile, more or less spherical or ovoid, 30-50 jx in 

 diameter, wall thin, colorless; rhizoids not observed; zoospores mi- 

 nute, somewhat elongate with a narrower anterior end, 2 \i long by 

 f u. wide, with a strongly refractive anterior granule and a single fairly 

 strong anterior flagellum, emerging in great numbers from an imper- 

 ceptible orifice and quickly swimming away; resting spores not observed. 



On filaments of Mastigothrix aeruginea, imbedded in the gelatinous 

 sphere of Chaetophora, Germany. 



From the anterior flagellation of the zoospore, the fungus belongs 

 to none of the three genera to which it has been assigned. If further 

 study confirms the observations of Nowakowski on this point it should 

 be placed in the Hyphochytriales. 



* Rhizophydium monoporum Maire 



Bull. Soc. Linn. Normandie, VI, 2: 68. 1910 



Sporangium opening by a single pore; rhizoids absent. 

 On pollen grains of Pinus, France. 

 Insufficiently described. 



* Rhizophydium (?) setigerum Scherffel 



Arch. Protistenk., 53: 48, pi. 2, fig. 95. 1925 



Resting spore sessile, spherical, thick-walled, the upper part of the 

 outer wall with a tuft of long radiating hairs; other features unknown. 

 On oospore of Oetlogonium sp., Hungary 



Although it is impossible to assign this resting spore to any genus 

 of chytrids, it closely resembles that of Rhizophydium chaetiferum. 



* Rhizophydium utriculus Scherffel 



Arch. Protistenk., 54: 173, pi. 9, fig. 11. 1926 



Sporangium sessile, consisting of an irregular more or less cylin- 

 drical short tube resting with its smaller, somewhat curved base on 



