CHYTRIDIALES 135 



two to five in a zygospore of the host, wall smooth, discharge tube 

 single, up to 70 ;x in length, 3-4.2 \x in diameter, strongly constricted 

 when passing through the wall of the zygote and expanded locally 

 (up to 6 [j.) on its outer surface, extending for a variable distance out- 

 side the gametangium wall; zoospores spherical, about 3.6 [jt in diam- 

 eter, with a single flagellum; resting spore spherical or ellipsoidal, 

 16.8-24 [x in diameter, from one to three in a zygote, with a smooth 

 golden-yellow wall 1.6 \x thick, contents with a large central globule, 

 germination not observed. (Modified from Tokunaga.) 

 In zygospores of Spirogyra jurgensii, Japan. 



Olpidium entophytum (Braun) Rabenhorst 



(Fig. 13 A, p. 136) 



Chytridum entophytum Braun, Monatsber. Berlin Akad., 1856: 589. 



Flora Europaea algarum, 3: 283. 1868 



Sporangium spherical, ellipsoidal, ovoid, or somewhat pyriform, 

 5.7-27.7 jo. in diameter, wall thin, smooth, colorless, discharge tube 

 (rarely two) isodiametric throughout, variable in length, up to 14.8 \x 

 long by 3-5.7 [x in diameter; zoospores spherical, 3-5 [x in diameter, 

 with a colorless globule and a long flagellum, forming a temporary, 

 motionless mass at the orifice of the discharge tube; resting spore 

 spherical or ellipsoidal and 11-22.5 \x broad by 18.5-29.6 \x long, wall 

 smooth, thick, colorless, contents dense, germination not observed. 



In Vaucheria globifera (salina?), de Bary (in Braun, he. cit.), Spiro- 

 gyra, Vaucheria, Kloss (in Braun, he. cit.), V. geminata, V. sessilis, 

 Schenk (1858a: 237), Cladophora ghmerata, Vaucheria sp., Schroeter 

 (1885: 181), Germany; Vaucheria, Dangeard (1886a: 286, pi. 14, fig. 

 11), Cladophora sp., de Wildeman (1895c: 215), France; Desmidium 

 swartzii, de Wildeman (1893b: 49, pi. 7, fig. 4), Belgium; Vaucheria 

 sp., Constantineanu (1901:370), Rumania; Spirogyra sp., Skvortzow 

 (1925:428), Manchuria; Spirogyra communis, Aegagropila sauteri, 

 Tokunaga (1933b: 79, pi. 5, figs. 1-3), Japan; Spirogyra sp., Sparrow 

 (1933c: 515), oospores of Oedogonium sp., Bulbochaete sp., Sparrow 

 and Barr (1955: 553), United States; Cladophora sp., Sparrow (1936a: 

 427, pi. 14, fig. 6), Great Britain; zygote of Oedogonium sp., Shen 

 and Siang (1948: 180), China; Gheocystis bacillus, Skuja (1948: 379, 



