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Permanent link (DOI): https://doi.org/10.7939/R3222R832

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Upper Cretaceous Araucarian Cones from Hokkaido and Saghalien: Araucaria nipponensis Sp. Nov. Open Access

Descriptions

Author or creator
Stockey, R.A.
Nishida, H.
Nishida, M.
Additional contributors
Subject/Keyword
affinities
cuticle micromorphology
leaves
Japan
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Six ovulate, permineralized cones, four cone-scale complexes, and one isolated seed are described from the Upper Cretaceous Upper Yezo and Miho Groups from Hokkaido, Japan, and Saghalien, Russia. Cones are spherical, 3.5-6.0 cm in diameter, with prominent thick bracts. Thick ovuliferous scales are almost completely united with the bracts and are not readily distinguishable on all scales. Cone-scale tissues consist of prominent abaxial and adaxial sclerenchyma bands with a central zone of thin-walled cells filled with dark contents that are often missing in abraded cones. Cone-scale vasculature is located in the thin-walled cells of this central zone. There is one large ovule per cone-scale complex with a thick sclerotesta showing a zigzag sclereid pattern. The nucellus is free from the integument except at the chalaza and shows a prominent wavy apex. Megagametophytes and embryos with two cotyledons are poorly preserved but are present in a few seeds. The presence of pollen tubes in the nucellar tissues of a fossil araucarian is demonstrated for the first time in these cones. Cones can be distinguished from those of Araucaria nihongii by a larger overall size at maturity, the structure of the cone-scale and its tissue composition, the lack of a bract abscission layer, and a thicker ovuliferous scale without a prominent \"ligular sulcus.\" These cones show similarities to the South American section Araucaria (= Columbea) species and are known to have shed their scales at maturity.
Date created
1994
DOI
doi:10.7939/R3222R832
License information
Rights
Copyright 1994 by The University of Chicago
Citation for previous publication
Stockey, R.A., Nishida, H., and Nishida, M. (1994). Upper Cretaceous Araucarian Cones from Hokkaido and Saghalien: Araucaria nipponensis Sp. Nov. International Journal of Plant Sciences , Vol. 155, No. 6, 806-815
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File title: Upper Cretaceous Araucarian Cones from Hokkaido and Saghalien: Araucaria nipponensis Sp. Nov.
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File language: en
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