CHYTRIDIALES 169 



spore spherical, yellowish brown or reddish, with dense contents, wall 

 slightly thickened, covered with tenuous spines, germination not ob- 

 served, predominantly formed in the spiny sporangia of the host. 



Parasitic in smooth and spiny sporangia of Araiospora spinosa, 

 Cornu {loc. cit.), France; Minden (1915:252), Germany; R. K. 

 Benjamin (comm.), United States. 



Cornu noted that the sporangial stage of the parasite was predom- 

 inantly formed in the smooth sporangia of the host, the resting spores, 

 in the spiny sporangia. The fungus developed extensively in his cul- 

 tures and prevented the making of a complete study of the "Rhipid- 

 ium" {Araiospora). 



Rozella blastocladiae (Minden) Sparrow 

 Mycologia, 30: 377. 1938 



Pleolpidium blastocladiae Minden, Kryptogamenfl. Mark Brandenburg, 

 5: 253. 1911 (1915); Falck, Mykolog. Untersuch. Berichte, 2 (2): pi. 4, 

 fig. 33. 1916. 



Sporangium assuming the shape of the hypertrophied host spo- 

 rangium, which becomes somewhat broader and more ovoid than 

 normal, with an apical pore, collapsing after discharge of the zoospores ; 

 zoospores not observed; resting spore exactly spherical, brown, thick- 

 walled, the exospore densely covered with tenuous spines, germination 

 not observed. 



Parasitic in sporangia and immature resting spores (?) of Blastocladia 

 pringsheimii, Minden {loc. cit.), Laibach (1927: 624), Germany; Thaxter 

 (1896a: 50), R. K. Benjamin (comm.), United States; H. E. Petersen 

 (1909:424, fig. 26c-d; 1910:555, fig. 26 c-d), Denmark; B. pring- 

 sheimii, B. gracilis, Waterhouse (1942:317), Great Britain. 



Rozella apodyae-brachynematis Cornu 

 Ann. Sci. Nat. Bot., V, 15: 161, pi. 5, figs. 10-14. 1872 



Pleolpidium apodyae (Cornu) Fischer, Rabenhorst. Kryptogamen-Fl., 

 1 (4): 45. 1892. 



Sporangium filling the sporangium of the host and assuming its 

 shape, with a small apical papilla; zoospores somewhat elongate, with 



