LAGENIDIALES 935 



A. prolifera, Fischer (Joe. cit.), host (?), Minden (1915: 267), Germany; 

 Achlya flagellata, A. flagellata var. yezoensis, A. racemosa, Tokunaga 

 (1933a: 21, pi. 2, figs. 1-2), Japan; Achlya prolifera, Achlya sp., Sawada 

 (see Tokunaga, op. cit., p. 22), Formosa; Achlya sp., Sparrow (1936a: 

 425), Great Britain. 



Sorokin (1883: 27, fig. 27) assigns oblong sporangia found in Achlya 

 and Saprolegnia in European and Asiatic Russia to this species. 



Because of the great differences in the shape and the size of the spo- 

 rangia and in the size of the resting spore as described by various inves- 

 tigators, all their data were not included in the diagnosis. Briefly, 

 according to these observers, they are as follows : 



Reinsch (1878): Sporangia oblong, irregularly cylindrical or ellip- 

 soidal, 22.4-39.3 \x (in diameter?); resting spore colorless, 22.4-39.3 \x; 

 companion cells from one to three, ellipsoidal, 16.8-22.4 \i in diameter. 



Butler (1907) : Sporangia spherical, up to 80-120 \x in diameter, resting 

 spore yellowish brown, 40-60 \x in diameter, with a single globule; com- 

 panion cell smaller. 



Sparrow (1932b): Sporangia ovoid or ellipsoidal, occasionally with 

 small spines, 21.7 (x long by 10.4 \x wide; resting spore colorless, 34.5- 

 52.6 (jl in diameter, spines 10.5 (jl long; companion cell 18.5 \x in diameter. 



Tokunaga (1933a): Sporangia spherical or ellipsoidal, sometimes 

 elongate, 45-97 \x long, 25-50 [jl wide, with from one to two discharge 

 tubes; resting spore spherical, 32-52 \x in diameter, yellowish brown; 

 companion cells from one to two, 16-24 \x in diameter. 



Sawada (see Tokunaga, 1933a: 22): Sporangia not observed; resting 

 spore ovoid to globose, hyaline or yellowish, 24-100 [J. in diameter, the 

 wall covered with conical sharp-pointed spines 9-24 \x long. 



Olpidiopsis achlyae McLarty 

 Bull. Torrey Bot. Club, 68: 62, figs. 1-26. 1941 

 "Zoosporangia solitary or numerous, usually localized in a terminal 

 or intercalary swelling of the host filament, slightly brown and granular, 

 enclosed at maturity by a cellulose wall, smooth or covered with fine or 

 coarse non-cellulose bristles; spherical, oval, ellipsoidal or elongate, 

 variable in size, 13.2-112.4 \x diam. 1 15.0 666.4 [x; one to three exit 



