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26 families studied 42 from Chippewa air-conditioned greenhouse anthers autotetraploid C(gxa CM o CM CM rH controlled pollination decapitation technique F hybrids involved fair family means ranged female and male female fertility fertile plants fertility tests following selfing fruit per pollination genetic studies H CM H O CM H r-l haploids US-W Hcugas inbreeding incidence and level inter-mating Jour Katahdin and US-W M-Sfl M-sn male fertility MrSA MrSfl MrSn Peloquin and Hougas phure.ia tt phure.ja selections phure.ja-haploid phureja tt phureja tt P.I. plants tested pollen germinability pollen on artificial pollen shedding pollination and seeds poor pseudo-fertility r-l H R. W. and S. J. rt-sn S. J. Peloquin seed set seeds per fruit Self-fertility was determined shed pollen freely Solanum tuberosum stainability Table tt P.I. tt tt X us-w tt-sn tub ere sum tuberosum F tuberosum haploids University of Wisconsin US-W 1 US-W w-sn