Proliferated megasporangiate strobili of Zamia furfuracea (Zamiaceae, Cycadales) and its possible evolutionary implications for the origin of cycad-megasporophylls

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2013
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Rozynek, Brigitte
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Palaeodiversity ; 6 (2013). - pp. 135-147. - ISSN 1867-6294. - eISSN 1869-4802
Abstract
At a 30-years-old individual of Zamia furfuracea (Zamiaceae, Cycadales) cultivated in the Botanic Garden Bochum (Germany), several proliferated megasporangiate strobili were found. The morphology of normal and proliferated strobili was compared. Within the proliferated strobili the sequence of megasporophylls, cataphylls, trophophyll-like leaves, followed again by a flush of cataphylls, was similar to those developed at the stems of extant Cycas species. However, all proliferated megasporangiate strobili were sterile. Within the proliferated strobili the pinnate trophophyll-like leaves that were replacing the terminal megasporophylls can be regarded as an atavism possibly reflecting the primitive character of megasporophylls in cycads. Thus, the results of the morphological examinations and also the comparison with fossil taxa may deliver new data supporting the idea that pinnate cycad-megasporophylls are a plesiomorphic feature within cycads.
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560 Paleontology
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Zamia, Cycadales, strobilus, megasporophyll, proliferatio
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ISO 690DÖRKEN, Veit, Brigitte ROZYNEK, 2013. Proliferated megasporangiate strobili of Zamia furfuracea (Zamiaceae, Cycadales) and its possible evolutionary implications for the origin of cycad-megasporophylls. In: Palaeodiversity. 6, pp. 135-147. ISSN 1867-6294. eISSN 1869-4802
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@article{Dorken2013Proli-29482,
  year={2013},
  title={Proliferated megasporangiate strobili of Zamia furfuracea (Zamiaceae, Cycadales) and its possible evolutionary implications for the origin of cycad-megasporophylls},
  url={http://www.palaeodiversity.org/backissues.htm},
  volume={6},
  issn={1867-6294},
  journal={Palaeodiversity},
  pages={135--147},
  author={Dörken, Veit and Rozynek, Brigitte}
}
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