Bierhorst, D.W. 1954: The gametangia and embryo of Psilotum nudum. American Journal of Botany 41: 274–281.
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Bierhorst, D.W. 1954: The gametangia and embryo of Psilotum nudum. American Journal of Botany 41: 274–281.
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8 March 2013
1 October 2013