Rare species extinct fossil seed fern Mariopteris hirsuta coal age fossil plant

Description

My specimens are genuine and will be delivered with a "Certificate of authenticity, age and origin"  and scientific papers allowing to plant identification !!!
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Specimen:
VERY rare species from Mariopteris seed fern family:
C
oal age extinct seed fern
Mariopteris hirsuta
CORSIN
Locality:
All detailed and accurate data will be provided with the specimen
Stratigraphy:
Upper Carboniferous, Middle Pennsylvanian - Westphalian B
Age:
ca. 310 - 314 Mya,
Matrix dimensions:
ca. 11,5 x 10,5 x 2,0 cm ( white square on pictures is 1,0 x 1,0 cm )
Description:
VERY rare species from Mariopteris seed fern family:
Coal age extinct seed fern
Mariopteris hirsuta
CORSIN
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 Mariopreids 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 hirsuta
CORSIN