00523nam a2200121Ia 4500008004100000082001800041245012500059260004700184300001000231490006400241600002400305650007200329130903s9999    xx            000 0 und d  a581.331.1  L8  aMegasporogenesis; a comparative study of the ultrastructural aspects of megasporogenesis in Lilium, Allium and Impatiens  aWageningenbH.Veenman and Zonen B.V.c1978  a127p.  aMedelingen Landbouwhogeschool, Wageningen, Nederland, 78-16  aJeu, M.J.Deboer-de.  aGametogenesis-comparative method,Spermatogenesis-Comparative method