a1 Department of Genetics, University of Leicester, Leicester LE1 7RH, England
A spontaneous mutation conferring white plasmodial colour on the Myxomycete Physarum polycephalum has been analysed. The mutant whi-1 allele is recessive to whi+ in both heterokaryotic and heterozygous plasmodia. The whi locus is unlinked to mt, npfA, fusA and leu.
(Received August 22 1977)
p1 Present address: Room 56-720, Department of Biology, M.I.T., Cambridge, Mass. 02139, U.S.A.