1 68 AQUA TIC PHYCOMYCETES 



Parasitic in marine fungi; in sporangia of Chytridium polysiphoniae 



R. MARINA, p. 176 



Thallus polysporangiate, that is, giving rise to sporangia which form 

 linear conjoined segments ("sori") within the host hyphae; 

 resting spores solitary or numerous within the segments or hyper- 

 trophied parts of the host 

 Parasitic in members of the Saprolegniaceae 

 Parasitic in several species of Achlya and Saprolegnia 



R. septigena, p. 176 



Parasitic in Achlya flagellata and Dictyuchus R. achlyae, p. 177 



Parasitic in Allomyces R. allomycis, p. 178 



Rozella monoblepharidis-polymorphae Cornu 

 Ann. Sci. Nat. Bot., V, 15: 150, pi. 4, figs. 13-18. 1872 



Pleolpidiwn monoblepharidis (Cornu) Fischer, Rabenhorst. Kryptogamen- 

 Fl., 1 (4): 44. 1892. 



Sporangium formed in intercalary swollen parts of the hyphae, 

 ovoid, the lateral walls fused with those of the host, with a single 

 small lateral discharge pore; zoospores not observed; resting spore 

 spherical, brown, the thickened wall densely covered with tenuous 

 spines, in intercalary or lateral swellings of the host hyphae, germina- 

 tion not observed. 



Parasitic in Monoblepharis polymorpha, Cornu (loc. cit.), France; 

 Laibach ( 1 927), Minden (1915 : 254), Germany ; Monoblepharis macran- 

 dra, Sparrow and Barr (1955:554), United States. 



Rozella rhipidii-spinosi Cornu 

 Ann. Sci. Nat. Bot., V, 15: 153, pi. 5, figs. 1-9. 1872 



Pleolpidium rhipidii (Cornu) Fischer, Rabenhorst. Kryptogamen-Fl., 1 (4): 

 44. 1892. 



Pleolpidium araiosporae (Cornu) Minden, Kryptogamenfl. Mark Bran- 

 denburg, 5: 252. 191 1 (1915). 



Sporangium completely tilling the abnormally swollen and obpyri- 

 form usually smooth sporangium of the host, with a prominent apical 

 papilla: /oospores variable in shape, reniform, spherical or ellipsoidal, 

 with a long posterior llagellum, discharged through a broad pore, 

 resting a lew seconds at the orifice before swimming away; resting 



