Nilssoniopteris oishii Tosh.Yamada, J.Legrand et H.Nishida in Yamada, Nishida & Legrand

Plant Fossil Names Registry Number: PFN002355


Authors: T. Yamada, J. Legrand & H. Nishida

Rank: species


Reference: Yamada, T., Nishida, H. & Legrand, J. (2009): Structurally preserved Nilssoniopteris from the Arida Formation (Barremian, Lower Cretaceous) of southwest Japan. – Review of Palaeobotany and Palynology 156: 410–417.

Page of description: 411

Illustrations or figures: pls I, II


Holotype NSM-PP-9177, National Museum of Nature and Science, Tokyo, Japan
Figures: pl. I, figs 1–6, pl. II, figs 1–5

Original diagnosis/description

Gymnosperm leaf with segmented lamina with dense, simple parallel veins, 27–30 per cm. Stomata confined to intercostal area on abaxial surface. Stomata round to elliptic and oriented perpendicular to veins. Guard cells slightly overlapped by adjacent subsidiary cells. Trichome bases on abaxial surface. Rachis rhomboidal in cross section.


Specific epithet in honor of the late Prof. Saburo Oishi, who undertook many foundational studies on Japanese Mesozoic flora.


Cretaceous, Lower Cretaceous, Barremian
Arida Formation


Loc. 2508 in Yoshikawa, Yuasa, Wakayama Prefecture (Obata et Ogawa 1976: Bull. Natl. Sci. Mus. Ser. C, 2: 93–110.)

Plant fossil remain

macro- and meso-fossils-embryophytes except wood


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