CHYTRIDIALES 503 



off by a cross wall, 30-41 jo. high by 12-21 \x. in diameter, resting on a 

 very short flexible extramatrical stalk; rhizoids delicate, branched, 

 bushy; zoospore discharge not observed; resting spore not observed. 



Parasitic on Navicula oblonga, Austria. 



Friedmann considered it probable that the fungus entered the host 

 through a pore of the "transapical stripe" on the frustule. The host 

 seemed little affected by the presence of the parasite; diatoms with as 

 many as five fungi on them continued to move. 



Since no zoospore discharge was observed, it is impossible to place 

 this fungus generically with certainty. If it is inoperculate, as seems 

 likely from the figures, it is more closely allied to Podochytriwn. If oper- 

 culate, it cannot be either the fungus seen by Scherffel (1926a) or the 

 one observed by Sparrow (1933a. 63, fig. 1 a-c, m; 1936a: 437, fig' 

 3 g-t, 4a). 



Chytridium lecythii (Ingold) Goldie-Smith 

 Trans. Brit. Mycol. Soc, 29: 68, fig. 1. 1946 



Rhizophidium lecythii Ingold, Trans. Brit. Mycol. Soc, 25: 47, fig. 3, pi. 4, 

 figs. 2-5. 1941. 



Sporangium obpyriform or top-shaped, 20-40 by 16-32 [X, by the 

 dehiscence of a large operculum forming an apical pore, the empty 

 sporangium vase-shaped; endobiotic system consisting of a stout 

 straight stalk with fine rhizoids branching from its tip; zoospores pos- 

 teriorly uniflagellate, with a small eccentric globule; resting spores not 

 observed. 



Parasitic on living individuals of the rhizopod Lecythiwn hyalinum, 

 Great Britain. 



Goldie-Smith {he. cit.) noted zoospore discharge (not seen by Ingold) 

 occurred after the dehiscence of a very broad operculum, which consists 

 of the whole upper one-quarter of the strongly obpyriform sporangium. 



Chytridium pyriforme Reinsch 



J. Linn. Soc. London (Bot.), 15: 215. 1877 



Zoosporangium obpyriform, gradually narrowing toward the base, 

 26-28 \i high by 13-17 [x in diameter, wall distinctly thickened; rhizoids 



