Very Rare Carboniferous fern Discopteris pre dinosaur fossil plant leaves

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:
Big
plate with very rare, coal age fossil plant - nice fern:
Discopteris karwiensis
STUR
Locality:
All detailed data will be provided with the specimen
Stratigraphy:
Upper Carboniferous, Middle Pennsylvanian / Namurian B
Age:
ca. 320 Mya,
Matrix dimensions:
ca. 15,5 x 10,0 x 4,0 cm ( white square on last picture is 1,0 x 1,0 cm )
Description:
Big
plate with very rare, very nice , detailed coal age fossil plant - nice fern:
Discopteris karwiensis
STUR
Seed ferns (Pteridosperms)
were group of seed plants from the Carboniferous and Permian periods (about 360 to 250 million years ago).
Some, such as Medullosa ( Lonchopteris, Neuropteris, Alethopteris etc.) grew as upright, unbranched woody trunks topped with a crown of large fernlike fronds;
others, such as Mariopterids, were woody vines. All had fernlike foliage; however, they reproduced by seeds, with ovules and pollen organs attached to the fronds.
Gamete - producing structures in the seeds were surrounded by a hard inner integument and a fleshy outer layer.
These features have led some authorities to speculate that these seeds may have been dispersed by animals. Some seeds were large. (
Pachytesta gigantea
, a seed of Medullosa, grew up to 7 cm long.) Pollen organs of seed ferns were also large and complex and were commonly made up of many pollen sacs fused into a large structure.
Systematic:
Kingdom
:        Chlorobiota Plantae
Family:
Sphenopteridae
Order:
Discopteris
Species:
Discopteris karwiensis
STUR