Nice fossil plant coal age extinct horsetail - Asterophyllites longifolius

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
:
Beautiful fossil plant unknown extinct horsetail
Asterophyllites longifolius
( STERNBERG ) BRONGNIART
Locality:
All detailed data will be provided with the specimen
Stratigraphy:
Upper Carboniferous - Pennsylvanian / Westphalian B
Age:
ca. 310 Mya
Matrix dimensions:
ca. 12,0 x 9,0 x 3,0 cm ( white square on pictures is 1,0 x 1,0 cm ),  Sigillaria 21,5 cm long
Description:
Asterophyllites longifolius
( STERNBERG ) BRONGNIART
-
Beautiful arborescent extinct horsetail !
Asterophyllites sp.
are the leaf whorls of an extinct horsetails. They would have grown on plants with stems like
Calamites
. A genus of fossil plants; star-leaf: so called from the stellated disposition of the leaves around the branches. They abound in the coal-measures, and are believed to be the branches of the
Calamites
or
Calamodendron
mother plants
.
The trunks of
Calamites
had a distinctive segmented, bamboo-like appearance and vertical ribbing. The branches, leaves and cones were all borne in whorls. The leaves were needle-shaped, with up to 25 per whorl.
Calamites
is a genus of extinct arborescent (tree-like) horsetails to which the modern horsetails (genus
Equisetum
) are closely related. Unlike their herbaceous modern cousins, these plants were medium-sized trees, growing to heights of more than 30 meters (100 feet). They were components of the understories of coal swamps of the Carboniferous period.
Annularia
are the leaf whorls of an extinct horsetail. They would have grown on plants with stems like
Calamites
. A genus of fossil plants; star-leaf: so called from the stellated disposition of the leaves around the branches. They abound in the coal measures, and are believed to be the branches of the
Calamites
or
Calamodendron.
Systematic:
Phylum:
Tracheophyta
Division:
Gymnospermatophyta
Class:
Equisetinae
Order:
Calamitales
Genus:
Asterophyllites
Species:
Asterophyllites longifolius
( STERNBERG ) BRONGNIART