CHYTRIDIALES 267 



Because of the tapering, unbranched rhizoid this species is considered 

 to belong in Rhizophydium. It is probably closely related to R. sphaero- 

 carpum or to R. vaucheriae. 



Rhizophydium halophilum Uebelmesser 

 Arch. f. Mikrobiol., 25: 312, fig. 2. 1956 



Sporangium spherical, 60-80 \i in diameter, with twenty-five to thirty 

 regularly arranged hyaline papillae 5-6 jo. high by 4 u. in diameter; 

 rhizoidal system with a well-developed single main axis and lateral 

 branches; zoospores escaping singly through pores formed upon the 

 deliquescence of the papillae, spherical, 5.5-6 u. diameter, contents 

 finely granular with a half-moon-shaped refractive posterior area, lack- 

 ing a globule, flagellum 30 [j. long; resting spore not observed. 



Pine-pollen bait, seaside soil, cultivated in sea water (Venice) Italy, 

 North Sea, Baltic, Mediterranean; saline soil (Utah) United 

 States. 



Rhizophydium pedicellatum Paterson 

 Mycologia, 48: 274, fig. 2, a-e. 1956 



"Sporangium clavate to ovate, smooth walled, 9-14.5 [x high by 

 7-12 u. in diameter, borne on an extramatrical stalk, 3-9 u, long, usually 

 procumbent, with the main axis and stalk parallel with the host, or 

 erect, with the stalk more or less perpendicular to the host filament; 

 rhizoids coarse, branched and tapering; zoospores numerous, spherical, 

 2-4 u, in diameter with a single eccentric refractive globule, 1-2 \x in 

 diameter, a small dark granule, and a posterior flagellum 15[x long, 

 escaping through a single apical pore; resting spore not observed" 

 (Paterson, loc. cit.). 



Parasitic on Melosira italica, United States. 



Rhizophydium piligenum Ookubo and Kobayasi 



Nagaoa, 5: 3, fig. 2. 1955 



"Sporangia sessile, globose or subglobose, 45-50 u, in diameter, 

 thin-walled, colourless, with 5-10 papillae, one or two of them becom- 

 ing somewhat cylindrical, 10-13 a in diameter, ca. 10 [x high, per- 



