346 AQUATIC PHYCOMYCETES 



spherical colorless oil globule 2 \i in diameter and a single posterior 

 flagellum about 20 \x in length; resting spores not observed. 



Saprophytic and weakly parasitic on Cladophora sp., United States. 



Probably identical with the fungus incompletely observed on Cladoph- 

 ora from Ithaca, New York (Sparrow, 1933c: 523, text fig. I, 3). It 

 differs from Phlyctochytrium dentiferum in having a more cylindrical 

 sporangium, which is slightly expanded distally up to the place of 

 emergence of the outer whorl of teeth, where it tapers sharply toward 

 the blunt rounded papillate apex. The papilla is surrounded by the 

 inner whorl of teeth. 



Phlyctochytrium dentiferum Sparrow 



Occ. Papers Boston Soc. Nat. Hist., 8:295. 1937; Amer. J. Bot., 25:489, 



figs. 15-32. 1938 



Sporangium slightly subspherical, 10-15 u. high by 10-14 \x in 

 diameter, colorless, with two apical concentric whorls of solid converging 

 apical teeth, the inner circle being composed of four minute (about 2 u. 

 high by 2 [i. wide) divergingly bipartite sessile ones which immediately 

 surround the discharge papilla, the outer, of six larger (about 4 ;x high 

 by 2.5 [j. wide) bipartite sessile or slightly elevated ones; endobiotic 

 system composed of a broadly fusiform spherical or irregular sub- 

 sporangial swelling, 5-15 \i in diameter by 5-12 ;jl in height, from 

 opposite sides of which emerges a moderately broad distally branching 

 rhizoid; zoospores spherical, 7 [jl in diameter, with a single large 

 slightly eccentric colorless oil globule 4 u. in diameter and a single 

 posterior flagellum about 30 \i in length; resting spore not observed. 



Saprophytic and weakly parasitic on Cladophora sp., United States; 

 zygospores of Spirogyra sp., Sparrow (1952a: 36), Cuba. 



RECENTLY DESCRIBED TAXA 1 



Phlyctochytrium bryopsidis Kobayasi and Ookubo 



Bull. Nat. Sci. Mus. (Tokyo), (N.S.), 1 (2), No. 35: 66, fig. 5. 1954 



"Zoosporangia gregarious, epibiotic, sphaerical or subsphaerical, with 

 rounded apex, 11-15 jj. long, 8-20 \x in diameter, thin-walled, smooth, 



1 Not included in the key. 



