RARE big Mississipian Lower Carboniferous primitive fossil fern Spehnopteridium

Description

My genuine specimens will be delivered with a "Certificate of authenticity, age and origin" and scientific papers allowing plant identification !
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Specimen:
Extremely RARE
,
Lower Carboniferous, Mississipian – Serpukhovian
fossils plant, fern
Sphenopteridium
(
Sphenopteris
)
adiantoides
SCHLOTHEIM with
Heterangium grievei
Williamson
Locality:
Poland,
from an old, non-existent outcrop. T
he exact location will be included with certificate to the purchase item
Stratigraphy:
Lower Carboniferous, Mississipian – Serpukhovian
Age:
ca. 330 Mya
Matrix dimensions:
ca. 18,5 x 9,5 x 2,0 cm ( white square on pictures is 1,0 x 1,0 cm)
Description:
Extremely RARE, Lower Carboniferous - Mississipian fossil plant, fern
Sphenopteridium
(
Sphenopteris
)
adiantoides
SCHLOTHEIM
=
Sphenopteris elegans
BRONGNIART
( later
synonym for name ) with
characteristic for the lower Carboniferous striated stem called
Heterangium grievei
WILLIAMSON
from an old, non-existent outcrop.
Lower Carboniferous - Mississipian plants are extremely rare
in fossil collections around the world
and are found only in a few small locations around the world.
This is due to the fact that these plants grew millions years before the carbon-forming flora from which coal was formed and the Lower Carboniferous layers are not exploited for coal mining.
Systematic:
Kingdom:        Chlorobiota - Plantae
Family:            Lyginopteridae
Genus:            Sphenopteridium ( Sphenopteris )
Species:
Sphenopteridium (Sphenopteris) adiantoides
SCHLOTHEIM
=
Sphenopteris elegans
BRONGNIART
with
Heterangium grievei
WILLIAMSON