304 AQUATIC PHYCOMYCETES 



? Rhizophydium hyalothecae Scherffel 

 Arch. Protistenk., 54: 201, pi. 9, fig. 64. 1926 



Sporangium borne at the tip of a narrowly clavate extramatrical 

 stalk, imbedded, with the exception of its apex, in the gelatinous 

 sheath of the host, ovoid, 23 \x high by 22 \x in diameter, apex some- 

 what flattened, bearing a crown of prominent, solid, somewhat in- 

 curved, plain, long (2 \l) teeth (undetermined number), wall smooth, 

 somewhat thick, colorless; endobiotic system not observed; zoospores 

 spherical, with an eccentric colorless globule and a single flagellum, 

 discharge not seen; resting spore not observed. 



On Hyalotheca dissiliens, Hungary. 



Further observations on the number of teeth and the nature of the 

 endobiotic system are needed before the species can be adequately 

 defined. 



? Rhizophydium v. mindeni Valkanov 

 Arch. Protistenk., 73: 363, figs. 6-8. 1931 



Sporangium spherical, with from twenty to thirty long delicate 

 hairs radiating from the upper part, discharging its spores by means 

 of a terminal splitting; otherwise unknown. 



On oogonia of Oedogonium sp., Bulgaria. 



Probably referable to Chytridium chaetophilum or Rhizophydium 

 chaetiferum. 



? Rhizophydium multiporum de Wildeman 



Mem. Herb. Boissier, 1900 (15): 7; Bull. Acad. Roy. Belg. (Sci.), V, 17: 287, 



fig. 2. 1931 



Sporangium sessile, spherical, subspherical, or somewhat ovoid, 

 32-52 \l in diameter, with three or more prominent somewhat tubular 

 papillae about 4 u. in diameter, wall smooth; rhizoids, zoospores, and 

 resting spore not observed. 



Parasitic on oogonia of Vaucheria sessilis, coll. Massart, Belgium. 



The fungus was never found on the vegetative filaments of the alga. 

 It could not be induced to live on the pollen of Salix or Alnus. It is 

 distinguishable from other multiporous species of the genus by the 

 prominent discharge tubes. 



