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Petrified plants from the cretaceous of the Kwanto mountains, central Japan. III. A polyxylic cycadean trunk,Sanchucycas gigantea gen. et sp. nov.

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Abstract

Sanchucycas gigantea gen. et sp. nov. is a fossil cycadophyte trunk from the Lower Cretaceous (Late Barremian—Early Aptian) Sebayashi Formation of the Sanchu area, Gunma Prefecture. It has polycyclic vascular bundles, pitted tracheids, uni- to hexaseriate rays, one or two large cross field pits, and mucilage sacs.Sanchucycas is most closely comparable withCycas andEncephalartos among living members of the Cycadales, but is distinct in its large number of xylem cylinders constituting a thick polyxylic wood, and in having mucilage sacs contrary to canals. This is the earliest record of polyxylic cycadean stems.

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Authors and Affiliations

  1. International Budo University, 841 Shinkan, 299-52, Katsuura

    Harufumi Nishida, Makoto Nishida & Kuniyuki Tanaka

  2. Chiba University, 1-33 Yayoicho, 260, Chiba

    Harufumi Nishida, Makoto Nishida & Kuniyuki Tanaka

  3. Suginami High School, 4 Narita Nishi, Suginami, 156, Tokyo

    Harufumi Nishida, Makoto Nishida & Kuniyuki Tanaka

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  1. Harufumi Nishida
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  2. Makoto Nishida
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  3. Kuniyuki Tanaka
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Contributions from the Laboratory of Phylogenetic Botany, Chiba University no. 122.

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Nishida, H., Nishida, M. & Tanaka, K. Petrified plants from the cretaceous of the Kwanto mountains, central Japan. III. A polyxylic cycadean trunk,Sanchucycas gigantea gen. et sp. nov.. Bot Mag Tokyo 104, 191–205 (1991). https://doi.org/10.1007/BF02489452

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