Beautiful Fossil flower like Pteridophyte horstail leaves - paired in siderite

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
:     Very  Nice
Flower like
Pteridophyte: Unknown
Annularia sp.
preserved as
positive & negative
paired in siderite matrix !
Locality:
All detailed data will be provided with the specimen
Stratigraphy:
Upper Carboniferous - Middle Pennsylvanian / Westphalian B
Age:
ca. 310 - 315 Mya
Matrix dimensions:
ca.
6,0 x 5,5 x 1,5 cm
Description:
Very  Nice
Flower like
Pteridophyte: Unknown
Annularia sp.
preserved as
positive & negative
paired in siderite matrix !
Pteridophyte fossil horsetail:
Annularia sp
- Carboniferous age fossil plant !
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
Family:         Calamariaceae
Genus:         Annularia
Species:
Annularia sp.
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.
Their trunks produced secondary xylem, meaning they were made of wood. The vascular cambium of
Calamites
was
unifacial
, producing secondary xylem towards the stem center, but not secondary phloem.
The stems of modern horsetails are typically hollow or contain numerous elongated air-filled sacs.
Calamites
was similar in that its trunk and stems were hollow, like wooden tubes. When these trunks buckled and broke, they could fill with sediment. This is the reason pith casts of the inside of
Calamites
stems are so common as fossils.
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:         Mesocalamites
Species:
Calamites sp.