Abstract
Beck’s (1960) discovery of the organic connection between the leaf of a free-sporing fern, Archaeopteris, and a stem, Callixylon,with gymnospermous characters led to the establishment of the Class Progymnospermopsida, the probable progenitors of gymnosperms (Namboodiri and Beck 1968). This finding of “plants having gymnospermic secondary wood and pteridophytic reproduction” had a profound effect on the interpretation of the origin of gymnosperms and their systematics.
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© 1997 Springer-Verlag Berlin Heidelberg
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Biswas, C., Johri, B.M. (1997). Progymnospermopsida. In: The Gymnosperms. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-13164-0_4
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DOI: https://doi.org/10.1007/978-3-662-13164-0_4
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