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  1. By: Bittencourt, Nelson S. (Nelson Sabino)
    Type: Article
    In: Acta Botanica Brasilica
    Date: 1996-07-01
    Subjects: Bignoniaceae  gametófito masculino  micrósporos  ontogenia  placentóide  pólen  Tabebuia  tapete  vacúolos nucleolares