224 AQUATIC PHYCOMYCETES 



part, swimming away one by one through the pore of papilla. Resting 

 spores imbedded in hair, then emerging, globose or subglobose with 

 thick and rough wall, 17-25 u. in diameter, containing one large oil 

 globule; germination not observed" (Ookubo and Kobayasi, he. cit.). 

 Human hair (as bait), Japan. 



IMPERFECTLY KNOWN SPECIES OF PHLYCTIDIUM 



? Phlyctidium dangeardii Serbinow 



Scripta Bot. Horti Univ. Imper. Petro., 24: 163, pi. 6, 

 figs. 22 AC. 1907 



Rhizophydium dangeardii Jaczewski, Opredelitel gribov .... I. Fikomit- 



sety, p. 38. 1931. 

 Tylochytrium dangeardii (Serbinow) Karling, Amer. J. Bot., 29:24. 1942. 



Sporangium sessile on the prosporangium of the host, spherical or 

 ovoid, wall smooth, colorless, two-layered, with a single small pro- 

 truding apical papilla; haustorium not observed; zoospores ovoid, 

 with a small globule and flagellum, about 1.5 jx long, escaping through 

 a small sessile apical pore; resting spore borne like the sporangium, 

 spherical, thick-walled, the inner wall smooth, the outer irregularly 

 undulate, germination not observed. 



Parasitic on prosporangia of the chytrid Saccomyces, Russia. 



No rhizoid is figured by Serbinow. It is possible that the fungus, 

 although placed in Phlyctidium, is in reality a Rozella parasitic in the 

 sporangium, rather than the prosporangium, of the host. 



? Phlyctidium minimum Schroeter 



Kryptogamenfl. Schlesien, 3 (1): 191. 1885 



Rhizophydium mini mum (Schroeter) Fischer, Rabenhorst. Kryptogamen- 

 Fl., 1 (4): 105. 1892. 



Sporangia sessile, spherical, mostly of the same size, about 6 [i in 

 diameter, with a short spherical haustorium. 



On Mougeotia p/euroearpa, Germany. 



Fischer believes this may possibly be only the immature stage of 

 "Chytridium mesocarpi Fisch." It was not mentioned by Schroeter 



