Abstract
By means of cultures and cytological investigations P. stipitata was shown to have a dimorphic diplo-haploidic life-history, as follows: The diploid spore-forming thalli produce diploid spores (2n = 12(14)). The sexual plants comprise a diploid meiosporophyte and numerous haploid gametophytes (n = 6(7)). Sex determination is haplogenotypic.

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