658 AQUATIC PHYCOMYCETES 



CATENOMYCES Hanson 



Torreya, 44: 30. 1944 

 (Fig. 44 H-K, p. 651) 



"Thallus usually polycentric, rarely monocentric, intra- and extra- 

 matrical; intramatrical portion branched or unbranched, septate; septa 

 delimiting the rudiments of the sporangia or sterile isthmuses; extra- 

 matrical portion branched, aseptate and sterile. Sporangia with one to 

 several exit tubes in which opercula develop beneath mucilaginous 

 plugs. Zoospores posteriorly uniflagellate. Resting spores unknown or 

 doubtful" (Hanson, loc. cit.). 



Saprophytic on vegetable debris. 



See remarks, p. 650. 



Catenomyces persicinus Hanson 

 Torreya, 44: 30. 1944 



"Protoplasm of intramatrical hyphae developing golden refractive 

 globules, while the protoplasm of the extramatrical hyphae remains 

 hyaline. Zoosporangia smooth, with peach-colored spore plasm at 

 maturity, variable in shape, uteriform [sic], 21-71 X 25-82 u., pyriform, 

 12-45 y. 19-82 \x, ovoid, 17-63 x 28-97 u., cylindrical, 6-15 x 19-75 u., 

 spherical, 17-57 jjl, elliptical, 21-62 37-159 u,, rectangular, 43-55 x 

 59-83 [jl, triangular, 35-59 x 44-65 \i, or irregular, 26-67 x 35-193 ix, 

 with 1-9 exit canals, 3.7-16 x 7.5-112 \x, frequently branched, and of 

 which only one functions. Tips of exit papillae or canals softening at 

 maturity and becoming filled with a plug of mucilaginous material; 

 granular protoplasm receding downward and forming an operculum 

 beneath the plug. Opercula extremely thin, shallow saucer-shaped, cir- 

 cular or oval in outline, 2.2-2.9 u, in diameter. Zoospores spherical, 

 3.7-4.5 [jl, with many golden refractive globules, flagellum approxi- 

 mately 30 \x long, emerging singly and forming a temporary group 

 near the orifice, intermittently amoeboid. Resting spores doubtful" 

 (Hanson, loc. cit.). 



Saprophytic on grasses, bleached corn (maize) leaves, onions, and 

 cellophane, from water and soil containing animal and vegetable debris, 

 Karling (1949c: 299), United States. 



