PLASMODIOPHORALES 779 



view of the preponderance of records for occurrence on Achlya, rather 

 than Saprolegnia, it is quite possible that different races of the species 

 occur in nature. 



Woronina asterina Tokunaga 

 Trans. Sapporo Nat. Hist. Soc, 13: 26, pi. 2, figs. 15-16. 1933 



Sporangia sorus linear, 96-216 \x long by 18-30 \x in diameter; zoo- 

 sporangia 4-20, in one or two rows, spherical, 12-19 \x in diameter, with 

 a thin smooth colorless wall and a short papilla; zoospores spherical or 

 ovoid, 3-4 \x in diameter; cystosorus like the sporangia sorus in size and 

 shape, cysts spherical, 12-22 \x in diameter, golden, the thick wall cover- 

 ed with large conical spines, germination not observed. 



Parasitic in hyphae of Achlya americana, Japan. 



This is a doubtful species according to Karling (1942e). 



Woronina glomerata (Cornu) Fischer 



Rabenhorst. Kryptogamen-Fl., 1(4): 67. 1892 



(Fig. 58 D-E, p. 778) 



Chytridium glomeratum Cornu, Ann. Sci. Nat. Bot., V, 15 : 187, pi. 7, figs. 

 20-22. 1872. 



Sporangia sorus cylindrical, variable in size, 70-300 \i long by 50-96 u. 

 in diameter; sporangia varying in number, spherical, 10-33 \i in diam- 

 eter, with a smooth colorless wall and a narrow discharge tube, zoo- 

 spores ellipsoidal to cylindrical, 3.6 by 2.4 \l, biflagellate ; cystosorus 



Whiffen in Achlya: F, thallus of parasite in tip of host hypha; G, group of 

 nearly mature zoosporangia ; H, zoospore bearing short anterior flagellum 

 and long posterior one; /, hypertrophied tip of host hypha bearing numerous 

 zoosporangia, some of which are discharging their zoospores; /, several groups 

 of resting spores, which, like the sporangia, are formed in great numbers in 

 swollen hyphal tips. K-M. Woronina polycystis Cornu on Saprolegnia sp.: K, 

 fixed and stained Plasmodium with nuclei at cruciform stage of division; L, 

 zoosporangial sorus with peripheral sporangia forming discharge tubes; M, 

 similar stage showing encysted zoospores on outside of host. 



{A, Sparrow, 1943; B, Cook and Nicholson, 1933; C, Cornu, 1872a; D- 

 E, after Zopf, 1894; F-J, Couch, Leitner, and Whiffen, 1939; K-M,Go\die- 

 Smith, 1954) 



