LAGENIDIALES 925 



Achlya spp. Prowse suggests that R. septigena and R. simulans are really 

 physiological strains of a single species, differing only in their host 

 range. 



Prowse (1954b) also made a careful study of Rozellopsis inflata as it 

 occurs on Zoophagus insidians and on certain other pythiaceous fungi. 

 His account of the zoospore behavior, infection, and development in 

 this species is the best that has yet been given for a member of the group. 



Rozellopsis simulans (Fischer) Karling 

 Amer. J. Bot, 29:34. 1942 

 Rozella simulans Fischer, Jahrb. wiss. Bot., 13: 365. 1882. 



Sporangia 60-250 \x long by 25-90 [jl in diameter; zoospores narrowly 

 ellipsoidal or cylindrical, 6 by 2.4 [i, with two anterior unequal flagella; 

 resting spore spiny; germination not observed. 



In Achlya polyandr a, A. racemosa, Fischer (loc. cit.), Minden (1915: 

 273) (including resting spores), Germany; Achlya, Maurizio (according 

 to Minden, 1915: 273), Italy; Achlya flagellata, Tokunaga (1933a: 25), 

 Japan. 



The species is like Rozellopsis septigena but is said to be confined to 

 Achlya. 



Rozellopsis inflata (Butler) Karling 



Amer. J. Bot., 29:34. 1942 



(Fig. 75 I, p. 939) 



Pleolpidium inflation Butler, Mem. Dept. Agr. India, Bot. Ser., 1 : 126, pi. 7, 

 figs. 17-21. 1907. 



"Sporangia spherical, oval or pyriform, formed in the spores of the 

 host which, with the supporting hyphae, are greatly swollen, up to 85 \x 

 in diameter, with one or more papillae; zoospores very numerous, 

 elongated, unequilateral, with two cilia, one in front and the other 

 lateral near the back; durable spores not seen" (Butler, loc. cit.). 



Parasitic in Pythium intermedium, Butler (loc. cit.), Pythium sp., 

 Sparrow (1943: 125), France; host? , Remy (1948:214), Germany; 

 Zoophagus insidians, Pythium spp., Prowse (1954b), Great Britain. 



