558 AQUATIC PHYCOMYCETES 



from one or opposite faces of the primary apophysis and terminating 

 distally in a main branching rhizoidal axis ; zoospores ellipsoidal, 9 by 

 5 [x, with a conspicuous hyaline globule and posterior flagellum, escaping 

 through a broad pore formed upon the dehiscence of an operculum 

 12-13 [i in diameter, and remaining in a compact quiescent group 

 before assuming motility; resting spore not observed. 



Saprophytic on cellophane bait, roadside soil, Cuba. 



Differing from the following species in the shape of its primary apoph- 

 ysate cell, regularly citriform sporangium and always compound apoph- 

 ysis. 



Catenochytridium laterale Hanson 



Torreya, 44: 32. 1944 



(Figs. 8 A-E, p. 97; 33 B, p. 564) 



"Zoosporangia hyaline, smooth, oval, 16-46 x 21-62 u., spherical, 

 12-44 jx, pyriform, 12-48 X 18-71 jx, cylindrical, 15-25 X 61-93 [x, and 

 lobed, 28-63 x 88-160 [i, when developed intramatrically ; operculum 

 apical, sub-apical, or lateral, 7.5-15 fx in diameter, generally persistent 

 on the empty sporangium. Primary apophysate cell always predominant, 

 spherical, ovoid, or lobed, up to 27-30 [x in diameter. Catenulate seg- 

 ments of the apophysis 1-7 in number, arranged in 1-4 linear series 

 attached to the primary apophysate cell laterally or apically, so that 

 they emerge between the primary apophysate cell and the sporangium, 

 rarely emerging from the base of the primary apophysate cell, often 

 completely lacking. Rhizoidal system (including primary apophysis) up 

 to 224 [x in extent, becoming finely branched; branching dichotomous. 

 Zoospores hyaline, spherical, 2.9^4.5 u, with two, three, four (rarely 

 one), refractive globules; flagellum 26-30 [x long. Zoospore case always 

 persistent on the zoosporangium, thickened, bulbous, never flattened, 

 amber to dark brown in color, rarely apical or lateral, but remaining 

 like a basal protuberance on the sporangium. Resting spores not 

 observed" (Hanson, he. cit.). 



Saprophytic on grasses, bleached corn leaves, onion, and cellophane, 

 United States. 



See Hanson (1946a) for figures and developmental details. 



