Crosses conducted between Batophora oerstedi J. Agardh and B. largoensis Prince and Baker, found that they were reproductively isolated. The crosses also showed that individual plants and gametangia of both B. oerstedi and B. largoensis produced cysts of
two mating types. Individual cysts of B. oerstedi and B. largoensis, however, contained gametes of only a single mating type. Pretreated cysts of B. oerstedi showed a considerable delay in releasing gametes while this delay was markedly shortened for cysts of B. largoensis.
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