LAG EN Wl ALES 931 



Olpidiopsis echinata H. E. Petersen, Bot. Tidsskrift, 29 (4): 405, fig. 28a. 

 1909; Ann. Mycologici, 8: 540, fig. 28a. 1910. 



Sporangium predominantly spherical, subspherical, ovoid, or ellip- 

 soidal, up to 150 [i. in diameter (45-50 by 3-36 \x when ellipsoidal), 

 generally terminal, occasionally intercalary in the hypertrophied host 

 filaments, wall thin, smooth or spiny, colorless, discharge tubes from 

 one to three, narrowly cylindrical, of variable length; zoospores ovoid 

 or ellipsoidal, 2-4 \x in length, with two apical or subapical oppositely 

 directed flagella; resting spore spherical, 47-107 [jl in diameter, colorless 

 or somewhat brownish, with a fairly thick wall, the outer surface dense- 

 ly covered with slender sharp spines about 5-10 \i in length, contents 

 with globules, germination not observed; companion cells from one to 

 two, ovoid or nearly spherical, 18-28 \i in diameter, wall thin, smooth, 

 colorless. 



Parasitic in filaments of Saprolegnia ferax, Nageli (1846), Braun (loc. 

 cit.), Pringsheim (I860: 205, pi. 24, fig. 15), Germany; Saprolegnia sp., 

 Cornu {loc. cit.), Dangeard (1890 91b: 88, pi. 4, figs. 5-8), "Saproleg- 

 niaceae," Arnaud (1952: 182, fig. 1A), France; Saprolegnia sp., Sorokin 

 (1883:27, fig. 27), European Russia, Asiatic Russia; S. dioica, S. 

 monoica, Petersen (loc. cit.), Denmark; Saprolegnia sp., Barrett (1912b: 

 232, pi. 23, figs. 2, 8-9, 21 A, pi. 24), Achlya imperfecta, A. flagellata, 

 Coker (1923: 184, pi. 62, figs. 7-10), Achlya sp.. Sparrow (1932b: 270, 

 fig. lc; 1933c: 515), Shanor (1940), Saprolegnia ferax, Wolf and Wolf 

 (1941 : 271), United States; Saprolegnia monilifera, Tokunaga (1933a: 

 24, pi. 2, fig. 9), Japan; Saprolegnia sp., Cejp (1934: 228, fig. 3), Czecho- 

 slovakia; host ('?), Forbes (1935b: 3), Great Britain; Saprolegnia 

 ferax, Shen and Siang (1948: 199), China; Achlya colorata, Saprolegnia 

 diclina, Beverwijk (1948: 229, fig. I), Holland. 



For convenience the records of Pseudolpidium saprolegniae are listed 

 separately : 



Parasitic in hyphae of Saprolegnia monoica, S. thureti, S. asterophora, 

 Fischer (loc. cit.), Saprolegnia sp., Pringsheim (1860: 205, pi. 24, fig. 14), 

 Saprolegnia sp., Schroeter (1885: 195), Minden (1915: 267), Germany: 

 Achlya (Saprolegnia ?) prolifera, Cienkowski ( 1 885 : 80 1 , pi. 1 2, fig. 8 and 

 others?), Russia; Saprolegnia sp., Sorokin (1883:27, fig. 28), Asiatic 

 Russia; Saprolegnia sp., Constantineanu (1901 : 372), Rumania; Achlya 



