1046 AQUA TIC PHYCOM YCETES 



tilling the oogonium, with a very thick refractive sometimes concentri- 

 cally layered wall, contents bearing a single large globule surrounded by 

 many small ones, upon germination converted (always?) into a zoo- 

 sporangium after resorption of the greater part of the wall. 



Saprophytic on fruits and twigs, Minden {be. cit.), Germany; Thax- 

 ter (1895b: pi. 31, fig. 16, oospore), United States; Lund (1934:53, 

 fig. 27), Denmark; Sparrow (1936a: 467, fig. 6 c, o-r, fig. 7 a-k), Great 

 Britain; decaying grass leaves, Sparrow (1952c: 106), Cuba; from soil, 

 substrate?, Gaertner (1954b: 22), South Africa. 



Minden states that this species may well be identical with the imper- 

 fectly described Pythium utriforme of Cornu (1872a: 13). The resting 

 spore suggested by Thaxter {be. cit.) as belonging to Gonapodya is 

 unquestionably that of the present species. 



No measurements of the zoosporangia were given by Minden. These 

 have been described by Lund (be. cit.) as 45-97 by 31-67 a., the dis- 

 charge tube as 49-63 u. long. In the material studied by Sparrow {be. 

 cit.) the zoosporangia were 32^45 y. long by 17-30 u. in greatest diameter. 

 The oogonia in Lund's material were, when spherical, 28-57 [x in diam- 

 eter, when subspherical, 34 by 36 u.; the oospores were 16-39 [x in diam- 

 eter. 



Pythiogeton ramosum Minden 

 Falck, Mykolog. Untersuch. Berichte, 2(2): 238, pi. 8, figs. 74-(?) 75. 1916 



(Fig. 88 E, p. 1045) 



Mycelium composed of occasionally branched main hyphae bearing 

 numerous secondary branches, on which the zoosporangia are formed; 

 zoosporangium terminal, narrowly bursiform, its long axis at right 

 angles lo that of the supporting hypha, the narrow apex usually extended, 

 internally proliferous; zoospores reniform, laterally biflagellate ; sex 

 organs unknown. 



On decaying beet root, Minden {be. cit.), Germany; rice seeds and 

 seedlings, Itoand Nagai(1931 : 48), Japan; twigs, Sparrow (1932b: 299, 

 pi. 8, fig. I),(?) Wolf (1944: 51), United States; Sparrow {be. cit.), 

 Canada; rice kernels, tomato fruit, Shen and Siang (1948: 202), China. 



No dimensions were given by Minden. The species was considered 



