Oligocarpia kepingensis Y.D.Wang et Wu

Plant Fossil Names Registry Number: PFN001985

Act LSID: urn:lsid:plantfossilnames.org:act:1985

Authors: Y. Wang & X. Wu

Rank: species

Reference: Wang, Y. & Wu, X. (1999): Oligocarpia kepingensis sp. nov. frm the Lower Permian of the northern Tarim basin, Xinjiang and its in situ spores. – Chinese science bulletin 44(2): 108–111., link

Page of description: 109

Illustrations or figures: pl. I, figs 1–17

Types

Original diagnosis/description

Frond at least bipinnate. Rachis comparatively broad and smooth. Pinnae alternate, linear to lanceolate; pinna rachis thin. Pinnae attached at an angle of 40°–70° to the rachis. Pinnules deltoid-oval, and attached with the whole base; margin of pinnule entire or slightly wavy. Pinnule apex obtuse. Sori arranged in two rows between the lateral margins and the midvein of the pinnule, 1–3 in each row (usually 2). Sori circular, 0.6–0.8 in diameter, consisting of 4–6 sporangia (usually 5); indusium lacking. Sporangia oval, with a diameter of 0.3–0.4 mm; annulus entire, transverse and consisting of one row of elongated cells. Each sporangium with probably 256 (varying from 200 to 300) trilete spores. Spores triangular to subtriangular in polar view, with rounded apices. Laesurae straight and raised, extending to 2/3–3/4 of spore radius. Both proximal and distal surface of spore smooth (psilate). Perispore not observed. Exine thin, 0.5–0.8 μm in thickness. Spore diameter 32.5–41 μm in equatorial view, averaging 38.5 μm.

Etymology

The specific name kepingensis refers to the Keping County, from where the specimens were colected.

Stratigraphy

Permian
The lower part of the Kaipaicileike Formation, the Lower Permian

Locality

China
Sishichang Coal Mine, Keping County, Xinjiang