Paradiospyroxylon kvacekii Koutecký et Sakala in Koutecký, Sakala & Chytrý

Plant Fossil Names Registry Number: PFN002962


Authors: V. Koutecký & J. Sakala

Rank: species

Genus: Paradiospyroxylon Koutecký et Sakala in Koutecký, Sakala & Chytrý

Reference: Koutecký, V., Sakala, J. & Chytrý, V. (2022): Paradiospyroxylon kvacekii gen. et sp. nov. from the Paleogene of the Czech Republic: a case study of individual variability and its significance for fossil wood systematics. – Historical Biology 35(online)(7): 1186–1196.

Page of description: 1187

Illustrations or figures: figs 2-4


Holotype XYL13 a–i (sample DR 23), Czech Geological Survey, Prague, the Czech Republic
Figures: figs 2–4

Note: Paratypes: Thin slides XYL12 a–c from the sample DR 02.

Original diagnosis/description

Wood semi-ring to diffuse-porous; earlywood vessel tangential diameters small to medium (50–140 μm), predominantly solitary, oval to angular outlines and arranged in radial pattern with single pores often separated by axial parenchyma cell or fibres. Vessel element lengths up to 550 μm, perforation plates simple, intervessel pits alternate, minute, vessel-ray parenchyma pits similar to intervessel pits. Rays up to four cells wide and up to 1 mm high, distinctly heterocellular with procumbent body ray cells and up to 11 rows of upright/square cells and often with multiseriate portions as wide as the uniseriate portions; non-storied. Axial parenchyma scanty paratracheal and apotracheal diffuse-in-aggregates with a slight tendency to make interrupted, one cell wide, wavy bands. Thin- to thick-walled non-septate fibres.


The species is named after Zlatko Kvaček as an honour to a great man and palaeobotanist who dedicated his life to the study of Tertiary floras and contributed greatly to our current knowledge.


Paleogene, Oligocene
lower Oligocene (Ústí Formation)


Czech Republic
Divoká rokle near Ústí nad Labem (GPS coordinates in WGS 84: 50.6841358 N, 14.1310592E)

Plant fossil remain

fossil wood


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