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 Supported, in part, by the National Science Foundation - Division of Undergraduate Education
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Thomas R. Warne and
Leslie G. Hickok.
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 C-Fern Web Manual - Culture of Gametophytes

  Hermaphroditic and male C-Fern gametophytes
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pH

The pH optimum for gametophytic growth of the wildtype is about pH 6.00. At pH below about 5.6, gametophytic growth is inhibited in a linear fashion.