ISO AQUATIC PH YCO M YCETES 



D. LaRuc, Nicaragua (Sparrow, 1943: 123); Shen and Siang (1948: 

 ISO. fig. 1). China: A. arbuscula, Sparrow (1952a: 35), Cuba; Allo- 

 myces sp., Gaertner (1954b: 40), Sweden. 



Germination of the resting spores, which, either wet or dry, retain 

 their vitality for several months, was secured after a rest period of 

 only a week when new water and fresh young Allomyces plants were 

 added to the culture. 



Miss Foust was unable to find evidences of a separate wall pro- 

 duced by the parasite. She noted that some sporangial rudiments laid 

 down one or more partitions within the primary segment which were 

 horizontal, vertical, or at angles to the original septa. If these sep- 

 tations should be clearly shown to be the result of only a single in- 

 fection they would be of great interest, as has been ind'cated else- 

 where (see p. 177). 



The "Rozella allomycetes" mentioned by Nabel (1939: 527), but not 

 described, probably belongs here. 



EXCLUDED SPECIES OF ROZELLA 



* Rozella allomycetes Nabel, nom. nud. 



Archiv f. MikrobioL 10 (4): 527. 1939 



A name unaccompanied by a description. Probably referable to 

 Rozella allomycis Foust. 



* Rozella barrettii Karling 

 Mycologia, 34: 202. 1942 



"Sporangia terminal and intercalary, of the same size as and in- 

 distinguishable from the host sporangia until zoospores are formed; 

 opening by one or more exit papillae which project through the host 

 wall. Zoospores numerous and minute. Resting spores unknown. 



"Parasitic in Phytophthora cactorum in California, U.S.A., causing 

 local spherical swellings in the host hyphae as well as completely 

 lilling the sporangia" (Karling. be. cit.). 



Based on an incompletely known form described by Barrett (1934: 

 1 138). Since the flagellation of the zoospores is not known, the fungus 

 cannot be placed generically. 



