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AbstractMain conclusionBoth male and female gametes of archegoniates are highly specialized cells surrounded by an… Expand Shoot development in land plants is a remarkably complex process that gives rise to an extreme diversity of forms. Our current… Expand The environmental influences that determine dorsiventral or axial gametophyte orientation are unknown for most modern seedless… Expand Ferns are, evolutionarily, in a pivotal position between bryophytes and seed plants (Pryer et al., 2001). Fern gametophytes, like… Expand Rhizoids of the fern Ceratopteris richardii Brogn. usually emerge 40 h after germination is initiated by light, and more than 90… Expand SummarySpores from a weakly salt tolerant strain of Ceratopteris richardii containing the mutation stl1 were irradiated and sown… Expand Strap-shaped prothalli of CERATOPTERIS: richardii grown in the dark have an apical meristem, a subapical elongation zone and a… Expand Abstract A procedure has been developed for isolating protoplasts from prothalli of Ceratopteris richardii which can be cultured… Expand