Journal of Plant Research

, Volume 108, Issue 1, pp 25–39 | Cite as

Yezonia, a new section ofAraucaria (Araucariaceae) based on permineralized vegetative and reproductive organs ofA. vulgaris comb. nov. from the upper cretaceous of Hokkaido, Japan

  • Takeshi Ohsawa
  • Harufumi Nishida
  • Makoto Nishida
Original Articles

Abstract

A new specimen of an araucarian cone,Araucaria nihongii, was found attached to the vegetative organs ofYezonia vulgaris, and is described asAraucaria vulgaris comb. nov. Thick branches show characteristic bark structure with lenticular patches. Secondary wood is usually araucarioid. Leaves are arranged helically on shoots, which are imbricate, appressed and fused to surface of the stem. External and anatomical features of leaves closely resembleBrachyphyllum. The seed cone is spherical with winged bracts and thin ovuliferous scales. One seed is borne per cone-scale complex. The seed coat and nucellus wall show typical araucarian structure. An araucarian plant that boreBrachyphyllum-like foliage and aEutacta-like seed cone was predicted by Harris in 1979. This reconstructed plant,Araucaria vulgaris, supports this theory and proves the presence of an extinct characteristic-form of the genus. A new section of the genus was proposed forAraucaria vulgaris.

Key words

Araucaria Araucariaceae Cretaceous Hokkaido Yezonia 

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Copyright information

© The Botanical Society of Japan 1995

Authors and Affiliations

  • Takeshi Ohsawa
    • 1
  • Harufumi Nishida
    • 2
  • Makoto Nishida
    • 3
  1. 1.Laboratory of Phylogenetic Botany, Faculty of ScienceChiba UniversityChibaJapan
  2. 2.International Budo UniversityChibaJapan
  3. 3.Research Institute of Evolutionary BiologyTokyoJapan

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