Abstract

There is fossil of linear whole-marginal leaves with parallel venation in the Middle Jurassic (Aalenian) sediments of the Irkutsk Coal Basin, were found. During the study of cuticle preparations it was found that leaves were steam-bearing, has anastomoses between veins, anomocytic stomata and the diamond-shaped main cells of the epidermis. Such a combination of characters is widespread in modern monocotyledonous and is absent among fossil as well as modern sporeals and gymnosperms plants. We have every reason to believe that we have found unique structures of leaves characteristic of monocotyledons. This find is the oldest among the herbaceous angiosperms of the Jurassic period, such as Yuraherba and Yukhaniya, and the first found in Siberia.

Highlights

  • During the study of cuticle preparations it was found that leaves were steam-bearing, has anastomoses between veins, anomocytic stomata and the diamond-shaped main cells of the epidermis

  • Such a combination of characters is widespread in modern monocotyledonous and is absent among fossil as well as modern sporeals and gymnosperms plants

  • We have every reason to believe that we have found unique structures of leaves characteristic of monocotyledons

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Summary

Introduction

Долгое время достоверные остатки покрытосеменных были известны только из нижнемеловых и более молодых отложений. Первая находка листьев покрытосеменного растения в среднеюрских отложениях Восточной Сибири В среднеюрских (аален) отложениях Иркутского угольного бассейна обнаружены линейные цельнокрайние листья с параллельным жилкованием. В ходе изучения фитолейм установлено, что данные листья являются влагалищными, имеют анастомозы между жилками, аномоцитные устьица, ромбовидные основные клетки эпидермы.

Results
Conclusion

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