CHYTRIDIALES 463 



by 10-17 (jl, oval, 6-8 by 9-12 to., spherical or oblong swellings which 

 are often transversely septate and divided into two equal parts (occasion- 

 ally three); zoospores spherical, 4.5-5.5 [i in diameter with a colorless 

 eccentric, spherical or crescentic globule and a flagellum 25-28 [i long, 

 emerging upon the deliquescence of the tip of the discharge tube and 

 forming a temporary motionless group imbedded in "slime," movement 

 amoeboid or swimming; resting spores spherical, 8-16 [i, oval, 10-12 

 by 14-16 [i, or broadly fusiform, with a colorless, smooth wall, upon 

 germination functioning as a prosporangium. 



In decaying tissues of Acorns calamus, Iris pseudoacorus, Glyceria 

 spectabilis, Nowakowski (loc. cit.), soil, Remy (1948: 214), Germany; 

 Hippuris vulgaris, de Wildeman (1895b: 91, pi. 3, figs. 14-23), France; 

 leaves of "Massette," Constantineanu (1901:385), Rumania; Acorus 

 calamus, Sparrow (1943: 309, fig. 20 I), grass leaves (bait), soil, Karling 

 (1948c: 510), United States; vegetable debris, Karling (1945a: 33, 

 figs. 31-51), Brazil; from soil, substrate?, Gaertner (1954b: 22), Egypt. 



The zoospore at germination produces one or two delicate filaments, 

 which after a few days become elongate and irregularly branched. 

 Spindle-shaped swellings soon appear and the sporangia are later formed 

 from some of these. 



De Wildeman's record is doubtful, since no zoospore discharge was 

 observed. The same might be said for the occurrence in Rumania 

 reported by Constantineanu. The fungus figured by Ookubo (1954, fig. 44) 

 does not appear to relate to Cladochytrium tenue. 



Cladochytrium taianum Shen and Siang 



Sci. Repts. Nat. Tsing Hua Univ., Ser. B: Biol, and Psych. Sci., 3: 183, fig. 5. 



1948 



"Rhizomycelium intramatrical and extramatrical, extensively branch- 

 ed, and anastomosed, with numerous fusiform, usually biseptate, rarely 

 multiseptate swellings; zoosporangia extramatrical, terminal or inter- 

 calary, non-apophysate, inoperculate, variable in shape and size, spher- 

 ical, subspherical or ovoid, 22-42 [i in diameter; zoospores hyaline, 

 spherical, 1 1 \x in diameter, containing a single refractive body meas- 

 uring 7.2 \i in diameter, posteriorly uniflagellate, exit tube not formed; 



