530 AQUATIC PHYCOMYCETES 



cally protruding papilla, 7-15 ix high, 6-7.5 jx in diameter, thin-walled, 

 hyaline, opened by the dehiscence of operculum, contained 20-30 zoo- 

 spores, penetration tube none, or thick and short. Apophysis turbinate, 

 smaller than zoosporangium, 3-5 x 4-5 \i, with one axial rhizoid. 

 Rhizoid commonly simple, rather thick and short, longitudinally elon- 

 gated, abruptly attenuated toward apex. Zoospores ellipsoid, 3 x 4 fx, 

 containing [with] one refracting body and a posterior fiagellum. Resting 

 body not observed" (Kobayasi and Ookubo, he. cit.). 



Parasitic on Bryopsis sp. (marine), Japan. 



Differing from other apophysate species of the genus in having a 

 single, coarse, unbranched, tapering rhizoid. 



IMPERFECTLY KNOWN SPECIES OF CHYTRIDIUM 



? Chytridium characii Scherffel 

 Arch. Protistenk., 53: 13, pi. 1, fig. 25 a-c. 1925 



Sporangium and zoospores not observed; resting spore epibiotic, 

 narrowly ovoid, oblong, or somewhat clavate, with the long axis per- 

 pendicular to the substratum, 5-6 jx in diameter by 10-14;x high (smaller 

 examples 4-7 by 7-9 [x), colorless, with an extremely thick wall of two 

 layers, the inner thick, refractive, homogeneous, and smooth, the outer 

 thicker at base or apex than in the mid-region, in optical section having 

 a well-defined prismatic structure, in surface view covered by longi- 

 tudinal rows of elongate warts, with a delicate branched rhizoid within 

 the host, germination not observed; companion cell spherical or some- 

 what clavate, thin-walled, 2-2.5 [x in diameter, sessile, without rhizoids, 

 connected to the base of the resting spore by a more or less elongate 

 narrow fertilization tube. 



Parasitic on Characium sp., Hungary. 



Observations on the sporangial stage will be necessary before this 

 fungus can be placed in the correct genus. Scherffel has suggested that 

 it may belong possibly in either Zygorhizidium or Rhizophydium. 



? Chytridium chlamidococci Braun 

 Abhandl. Berlin Akad., 1855:45. 1856 



Sporangia in groups, at first spherical, later somewhat oblong, not 

 over 10 [x long, sometimes with an oblique apiculus. 



