BLASTOCLADIALES 611 



did. Since the phenomenon is probably caused by some flagellum- 

 suppressing factor and since in most other respects the form resembles 

 A. moniliformis, the Trinidad strain will not be segregated here. 



Another interesting feature of the Trinidad strain was the frequency 

 with which repeated emergence of the zoospores occurred. Coker and 

 Braxton (1926) had figured this process in Allomyces moniliformis, but 

 Emerson (1941) doubted their explanation. Emerson thought they had 

 confused the phenomenon with the emergence of cyst-forming planonts 

 from resting spores. In view of this tendency, it would not be surprising 

 to find other members of the Cystogenes group exhibiting repeated 

 emergence, since essentially the same process gives rise to the isoga- 

 metes from the cysts. 



Allomyces neo-moniliformis Indoh 



Sci. Rept. Tokyo Bunrika Daigaku, Sect. B, 4: 271, figs. 2 d, 31-33, 34. 1940 



(Figs. 41 K-O, p. 622; 43, p. 629) 



Allomyces cystogenus Emerson, Lloydia, 4: 136, figs. 7, 10 A, 15, 1941; 



Mycologia, 30: 120, figs. 1-11. 1938. 

 Allomyces cystogenus var. cystogenus Emerson, loc. cit., p. 136. 1941. 

 Allomyces cystogenus var. elongotus Emerson, loc. cit., p. 136. 1941. 



Basal cell 25-43 \x in diameter at base, anchored by rhizoids to sub- 

 stratum, the hyphae with pseudoseptae and indeterminate in length, 

 subdichotomously branched, contents colorless; sporangia terminal, 

 cymose or catenulate, the terminal ones clavate to somewhat cylindrical 

 and 50-124 \i long by 20-40 \x in diameter, the catenulate ones barrel- 

 shaped; zoospores with a mean diameter of 10-12 [jl; resting spores 

 terminal or cymose, oval to elongate to almost clavate, 34-95 \i long 

 by 24-49 \x broad, with broadly rounded apex and scattered pits (about 

 3.5 \i apart); planonts from resting spores aflagellate or bearing two 

 posterior flagella, 9-12 [jl in diameter, quickly encysting, the cysts 

 (reduced gametophytes) giving rise to four isogamous posteriorly uni- 

 flagellate gametes which fuse in pairs, the resultant zygote producing 

 upon germination the sporophyte plant. 



In soil, Indoh [loc. cit.), Japan; soil, Emerson (1941); Burma, 

 Venezuela, China. 



The description has been drawn from those by Indoh and Emerson. 



