Rare ! Fossil plant older Mariopteris dernoncourti liana like climber fern frond

Description

My genuine specimens will be delivered with a "Certificate of authenticity, age and origin"  and scientific papers allowing plant identification !
I combine the shipping costs.
Each item is different, so please wait with payment after purchase -
I will send You a combine invoice.
Usually, it will be cost of shipping the heaviest item.
Specimen:
Rarer mariopterid species:
Mariopteris dernoncourti
ZEILLER
-
coal age liana like climber fern fossil
Locality:
Poland, GZW Upper Silesia Coal Basin, GZW
Stratigraphy:
Upper Carboniferous, Middle Pennsylvanian, Namurian B "Siodlowe" Beds
Age:
ca. 320 Mya,
Matrix dimensions:
ca. 11,0 x 7,5 x 1,5 cm ( white square - scale bar on pictures is 1,0 x 1,0 cm)
Description:
Mariopteridaceae
seed ferns (Pteridosperms) group contains two genera, Marioptris and Karinopteris.
Mariopteris
is a form genus for relatively small compact fronds which are bifurcated twice.
The pinnules are tongue-shaped to assymmetrically triangular in outline with a distinct basal lobe (at least the pinnules closest to the main axes). Although it is clear that most mariopterids are seed ferns, their natural affinity remains unclear. Karinopterids obviously had a climbing growth habit. This species, like other Karinopteroids and Mariopteroids, had a vine- to liana-like growth habit and climbed with specialized climber hooks.
Systematic:
Division:                Tracheophyta (Sphenopsida)
Kingdom:               Chlorobiota
Plantae
Family:                  Mariopteridaceae
Genus:                   Mariopteris (Zeiller 1878)
Species:
Mariopteris dernoncourti
ZEILLER