Discosoropteris zlatkokvacekii

Name

Discosoropteris zlatkokvacekii

Rank

Species

Generic Name

[Genus] Discosoropteris

Authors (Pub.)

Pšenička J. Zhou W.-M. Boyce C. K. Votočková Frojdová J. Bek J. Opluštil S. Wang J.  

Publication

Two new leptosporangiate ferns from in situ volcanic ash of the Whetstone Horizon (Kladno Formation, Pennsylvanian), Pilsen Basin, Czech Republic [2022/1]

Journal

Review of Palaeobotany and Palynology

Volume

299

Issue

104608

Page number

7

Year

2022

Fossil Status

foliage (fertile)

Stratigraphy

Moscovian

Strat. comment

Whetstone Horizon of the Radnice Member, Kladno Formation

Location

Doubrava locality (near Nýřany), Pilsen Basin, Plzeň Region, Czech Republic

Paleoregion

Laurussia (Perunica)

Data for Holotypus

Repository

Západočeské muzeum, Plzeň, Czech Republic

Repository Number

F7987

Num

VI: 1-5

Pub.

Two new leptosporangiate ferns from in situ volcanic ash of the Whetstone Horizon (Kladno Formation, Pennsylvanian), Pilsen Basin, Czech Republic [2022/1]

Diagnosis

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.