Rare species Mariopteris robusta liana like climber fern & Calamites fossil !

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:
Very Rare mariopterid species:
Mariopteris robusta
KIDSTON
&
Calamites sp.
fossils
Locality:
All accurate data will be provided with the specimen
Stratigraphy:
Upper Carboniferous, Middle Pennsylvanian, Westphalian A
Age:
ca. 305- 310 Mya,
Matrix dimensions:
ca. 11,0 x 8,0 x 2,0 cm ( white square - scale bar on pictures is 1,0 x 1,0 cm)
Description:
Very Rare mariopterid species:
Mariopteris robusta
KIDSTON
-
coal age liana like climber mariopterid fern fossil !
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 robusta
KIDSTON