672 AQUATIC PHYCOMYCETES 



large globose, clavate, or ovoid colorless female gametangium terminal, 

 40-60 (j. long by 16.5-30 u. in diameter, subtended by a short to long 

 cylindrical or barrel-shaped male gametangium 6.6-56 u, long by 13-24 

 ijl in diameter, with faintly golden or salmon-pink contents, female 

 gamete colorless, ovoid, 10-12 y. long by 3.6-7 [i wide, male gamete 

 ovoid or nearly spherical, 6-8 jjl long by 4-8 \i in diameter, planozygote 

 bifiagellate, upon germination forming the sporophyte. 



On insect cadavers (sporophyte only), Butler (Joe. cit.), India; Barrett 

 (/oc. cit.), North Carolina No. 2 isolate, gametophyte, coll. A. B. Couch, 

 Coker and Grant (loc. cit.), North Carolina No. 1 isolate, coll. W. C. 

 Coker, Emerson (1941), United States; Kniep (1930), Bali; Central 

 America: Mexico, Guatemala, Canal Zone; West Indies: Domin- 

 ican Republic, Haiti; South America: Brazil, Argentina; Eu- 

 rope: Portugal; Africa: Belgian Congo, Nyasaland, Uganda, 

 Cape Province; India (further isolations by Emerson): Ceylon, 

 Burma; Japan; China; Philippine Islands; Fiji Islands. 



Recent records: Cejp (1947), Czechoslovakia; Remy (1948), Ger- 

 many; Shen and Siang (1948), China; Sparrow (1952b), Cuba; 

 Gaertner (1954b), Africa; Kobayashi and Ookubo (1952a; 1954b), 

 Japan. 



Specific distinctions in the Euallomyces group depend in great 

 measure on the arrangment of the gametangia. Only the asexual plant 

 of Allomyces arbuscula was described by Butler and there are now no 

 living cultures of his fungus; hence, it is impossible to say just what he 

 had. Coker and Matthews (1937) associated with this species a game- 

 tophyte stage described by Hatch (1933), from the North Carolina No. 2 

 isolate, in which the female gametangium like that of Kniep's from 

 Bali is terminal. It is entirely possible that Kniep's A.javanicus was iden- 

 tical with Butler's fungus. Indeed, of four isolates obtained by Emerson 

 (1941) from the type locality of Butler's fungus, three turned out to be 

 A.javanicus and one A.anomalus. Since Kniep described both asexual 

 and sexual phases of his Java isolate, however, his species (subse- 

 quently shown to be a hybrid) should remain distinct. 



As here understood, Allomyces arbuscula is based on Butler's asexual 

 plant and on the North Carolina No. 2 strain, the gametophyte of 

 which was studied by Hatch. Most of the synonyms are questioned, 



