First findings of Xenoxylon (Coniferales) fossil wood in the Middle Jurassic deposits of the Belgorod and Kursk regions, Russia

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Fossil wood species Xenoxylon phyllocladoides of the Mesozoic genus Xenoxylon (Coniferales) is reported from the Middle Jurassic deposits of iron mines in the Belgorod and Kursk regions, Russia. This species is recorded for the first time in the European continental part of Russia. To date, fossil wood of X. phyllocladoides was recorded on the territory of Russia from the Jurassic and Lower Cretaceous deposits of Franz Josef Land, North-Eastern Siberia, North-Western Kamchatka and Southern Primorye.

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М. Afonin

V. L. Komarov Botanical Institute of the Russian Academy of Sciences

编辑信件的主要联系方式.
Email: mafonin@binran.ru
俄罗斯联邦, 2, Professor Popov St., Saint Petersburg, 197022

А. Lyubarova

V. L. Komarov Botanical Institute of the Russian Academy of Sciences

Email: mafonin@binran.ru
俄罗斯联邦, 2, Professor Popov St., Saint Petersburg, 197022

N. Nosova

V. L. Komarov Botanical Institute of the Russian Academy of Sciences

Email: mafonin@binran.ru
俄罗斯联邦, 2, Professor Popov St., Saint Petersburg, 197022

参考

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2. Fig. 1. a–d – Xenoxylon phyllocladoides Gothan, specimen No. 2577/6-1, Kursk Region, Mikhailovsky mine, Arkino Formation, Middle Jurassic, Middle – Late Bathonian; SEM. a – transverse section, growth rings, transition from the early wood to the late wood (scale bar = 120 μm); b, c – radial sections, pits on the walls of tracheids, cross-field pits (scale bars = 40, 30 μm); d – tangential section, rays, pits on the walls of tracheids (scale bar = 40 μm).

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3. Fig. 2. a–d – Xenoxylon phyllocladoides Gothan, specimen No. 2577/6-1, Kursk Region, Mikhailovsky mine, Arkino Formation, Middle Jurassic, Middle – Late Bathonian; LM. a – transverse section, growth rings, transition from the early wood to the late wood (scale bar = 120 μm); b – radial section, pits on the walls of tracheids (scale bar = 30 μm); c – radial section, pits on the walls of tracheids, cross-field pits (scale bar = 30 μm); d – tangential section, rays (scale bar = 40 μm).

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