174 AQUATIC PHYCOMYCETES 



Rozella rhizophlyctii Karling 

 Amer. J. Bot., 29: 32, figs. 36-47. 1942 



'"Sporangia solitary, filling host cell and conforming with the latter's 

 size and shape, spherical, 20-1 10 jx, oval, and irregular with 1 to 4 

 exit papillae which usually project out of the short necks of the host; 

 wall of sporangium usually indistinguishable from that of the host 

 cell. Zoospores hyaline, broadly pyriform, 2.5-3 y. x 1.5-2 jjl, tapering 

 slightly at the anterior end, with a minute globule near the posterior 

 end; posteriorly uniflagellate, rarely bi- and multiflagellate; fiagellum 

 L6 18 a long; swirling in the sporangium before emerging; darting 

 about rapidly in swimming, occasionally becoming amoeboid. Resting 

 spores slightly yellow, oval and spherical, 14—18 (x in diam., with a 

 large central vacuole and coarsely granular cytoplasm; wall spiny, 

 1.8 [i thick, spines 1.5-2 a long; apparently transformed directly into 

 a zoosporangium in germination and forming zoospores" (Karling, 

 he. cit.). 



Parasitic in Rhizophlyctis petersenii, Karling (he. cit.), causing no 

 apparent hypertrophy or septation of the host cells, United States; 

 Rhizophlyctis rosea, Karling (1944f: 644), Brazil. 



Rozella rhizophydii Karling 

 Mycologia, 36: 645, figs. 20-28. 1944 

 "Sporangia solitary, filling host cell and conforming with the latter's 

 size and shape, spherical, 15-30jx, oval, 10-12 x 13-20 a or pyriform, 

 12-15 16-25 a with 1-3 low exit papillae; wall of sporangium in- 

 distinguishable from that of host. Zoospores hyaline, oval or slightly 

 pyriform, 2-2.5 ■ 3-4 [x; with a small globule near the posterior end; 

 flagellum 12-14 u long. Resting spores unknown" (Karling, he. cit.). 

 Parasitic in Rhizophydium globosum, Brazil. 



Rozella cladochytrii Karling 

 Torreya, 41: 105. 1941 

 "Sporangia solitary in a host cell, spherical, 10-40 [x, ovoid, ellip- 

 15-35 |x, pyriform, and obclavate, hyaline and smooth 



