Discosoropteris zlatkokvacekii Pšenička, W.M.Zhou, C. K. Boyce, Frojdová, Bek et Jun Wang bis in Pšenička, Zhou, Boyce, Votočková Frojdová, Bek, Opluštil & Wang

Plant Fossil Names Registry Number: PFN003473

Act LSID: urn:lsid:plantfossilnames.org:act:3473

Authors: J. Pšenička, W. M. Zhou, C. K. Boyce, J. Votočková Frojdová, J. Bek & J. Wang

Rank: species

Genus:

Reference for this name: Pšenička, J., Zhou, W. M., Boyce, C. K., Votočková Frojdová, J., Bek, J., Opluštil, S. & Wang, J. (2022): Two new leptosporangiate ferns from in situ volcanic ash of the Whetstone Horizon (Kladno Formation, Pennsylvanian), Pilsen Basin, Czech Republic. – Review of Palaeobotany and Palynology 299: 1–25.

Page of description: 7

Illustrations or figures: pls IX, X, XI, XII, XIII

Types

Original diagnosis/description

The frond at least tripinnate. All rachises densely covered by multicellular uniseriate trichomes. Fertile and vegetative pinnules broadly oval, alternate on ultimate rachis, separated into 3–4 lobes, having deeply dentate margins. The midvein is prominent into c. 2/3 of pinnule length. Lateral veins twice or three times bifurcated, with one vein terminating in each tooth. Margin of the anadromous basal pinnule of ultimate pinnae is deeply dentate, sometimes resulting in acicular segments with a single vein per segment. The disc-shaped, hemispherical sori are dense, trichomatous, and borne abaxially on the midvein. Each sorus consists of around 80 annulate sporangia. Leptosporangia are 130–250 μm long and 100–160 μm wide, vertically elongate, shortly stalked, and immersed in a tangle of uniseriate multicellular trichomes. The semi-apical annulus occupies half the size of the sporangia. The apical zone consists of 5–8 relatively thick-walled polygonal cells. Trilete, subtriangular to circular microspores, laevigate, finely microgranulate, verrucate, microverrucate, conate, microconate, spinate and microspinate exine.

Etymology

The species name is given in honor of Prof. Zlatko Kvaček, a famous Czech palaeobotanist, who was an important mentor at the beginning of the first author's scientific career.

Stratigraphy

Carboniferous, Pennsylvanian
Whetstone Horizon of the Radnice Member, Kladno Formation; lowermost Moscovian (Duckmantian).

Locality

Czech Republic
Doubrava locality (near Nýřany) of the Pilsen Basin (Carboniferous of Central Bohemia).