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Eretmophyllum polypapillosum
Eretmophyllum polypapillosum An.O.Frolov, Mashchuk Acta Geol. Sin. Engl. Ed., 97(4): 1016. 12 Jun 2023
- Name
- Eretmophyllum polypapillosum
- Rank
- Species
- Generic Name
- [Genus] Eretmophyllum
- Authors (Pub.)
- Frolov A. O.
Mashchuk I. M.
- Publication
- Two new species of Eretmophyllum (Ginkgoales) from the Jurassic of Eastern Siberia [2023/6]
- Journal
- Acta Geologica Sinica
- Volume
- 97
- Issue
- 4
- Page number
- 1016
- Year
- 2023
- Fossil Status
- foliage
- Stratigraphy
- Toarcian
- Location
- Sukhov cape locality (52°30'12.6"N, 103°59'07.4"E), right bank of the Angara River, Irkutsk Coal Basin, Irkutsk region, Russian Federation
- Paleoregion
- Eurasia (Siberia)
Data for Holotypus
- Repository
- Institute of the Earth's Crust, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russian Federation
- Repository Number
- IEC No. 2020-SM/18-2
- Num
- Figs. 2b, c, f, g, i, j, 3c–g, i, j, l, n, p
- Pub.
- Two new species of Eretmophyllum (Ginkgoales) from the Jurassic of Eastern Siberia [2023/6]
- Diagnosis
- Leaves linear, entire-margined and gradually narrow to wedge-shaped base. Each leaf has 13 veins, which dichotomize near leaf base and then run parallel to its margin. Leaves amphistomatic. Non-stomatal band cells of lower epidermis short quadrangular, isodiametric with straight, usually uniformly thickened anticlinal walls; |periclinal walls with small flat papilla. Stomatal band cells of lower epidermis isodiametric quadrangular and polygonal with straight anticlinal walls and small flat papillae on periclinal walls. Some cells bear 2–3 papillae or longitudinal cuticular ridge. Stomatal complexes rounded or broadly oval, incompletely dicyclic. Guard cells lightly sunken and surrounded by 5–6 subsidiary cells, which do not differ from ordinary cells in degree of cutinization and bear well-developed proximal papillae.
