Studies of fertility of Dicranum majus in two populations with contrasted sporophyte production

  title={Studies of fertility of Dicranum majus in two populations with contrasted sporophyte production},
  author={Ida M. Sagmo Solli and Lars S{\"o}derstr{\"o}m and Solveig Bakken and Kjell Ivar Flatberg and B{\aa}rd Pedersen},
  journal={Journal of Bryology},
  pages={3 - 8}
Abstract Some populations of the dioicous moss Dicranum majus Sm. in southern Norway do not or only rarely produce sporophytes, while most populations in central Norway produce sporophytes frequently. Two populations of D. majus in spruce forest, one from southern Norway (without sporophytes) and one from central Norway (with many sporophytes) were investigated to find differences in sexual reproduction between them. The population in southern Norway had only a few perichaetia and neither dwarf… 
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Dwarf males (nannandry) appear to strongly reduce the problem of short fertilization distances in bryophytes, but the presence of water is still critical because the dwarf males are dependent on a certain level of humidity for recruitment and/or development.
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The regional vegetation of Norway; that of Central Norway in particular
  • A. Moen
  • Environmental Science, Geology
  • 1987
The vegetation of Norway varies along three main gradients: from south to north, from the lowlands to the mountains, and inland from the coast. The underlying criteria used in preparing the enclosed
Changes in the occurrence and abundance of plant species in a Norwegian boreal coniferous forest, 1988–1993
True five-year trends were found in the spruce forest: (1) Deschampsia flexuosa (increase), (2) several vascular plant species with preference for richer sites, notably Oxalis acetosella (decrease), and (3) most bryophyte species ( increase).
The relation between the occurrence of polysety and the number of archegonia in female inflorescences of Dicranum majus and D. scoparium.
Inflorescences of Dicranum scoparium contain 7–9 archegonia on average compared with 13–15 in D. majus, indicating that the supply of antherozoids was not saturating for fertilization and polysety was observed in only 5% of fertile shoots.
  • R. Greenberg
  • Medicine
    The Yale Journal of Biology and Medicine
  • 1969
The woman who takes oral contraceptives has a greater likelihood of being alive one year later than the woman who chooses to have a baby or use some less effective method of contraception, the authors conclude.