European fossil plant Classic fern Paripteris gigantea nice pinnule preserved !

Description

My specimens are genuine and will be delivered with a "Certificate of authenticity, age and origin"  and scientific papers allowing plant identification !
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Specimen:
Nice pinnule ( leaflet ) of european coal age seed fern
Paripteris gigantea
( Sternberg 1822 ) Gothan
Locality:
Poland, GZW Upper Silesia Coal Basin
Stratigraphy:
Upper Carboniferous,
Westfal A - Rudzkie Beds
Age:
ca. 315 Mya
Matrix dimensions:  13,0 x 9,0 x 1,5 cm ( white square on pictures is 1,0 x 1,0 cm )
Description:
Medullosan 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, 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:
Ordo:
Medullosales
Familia:
Whitleseyinae
Genus:
Paripteris
Species:
Paripteris gigantea
( Sternberg 1822 ) Gothan