Rarer Flower like fossil Pteridophyte extinct horsetail Sphenophyllum laurae !

Description

My specimens are gunine and will be delivered with a "Certificate of authenticity, age and origin"  and scientific papers allowing plant identification !
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I will send You a combine invoice.
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Specimen:
Rarer species of
e
xtinct liana-like
horsetail:
Sphenophyllum laurae
( Sternberg ) Zeiller
Locality:
All detailed and accurate data will be provided with the specimen
Stratigraphy:
Upper Carboniferous  – Pennsylvanian -  Westphalian B
Age:
ca. 310 - 315 Mya
Matrix dimensions:
ca. 6,0 x 5,5 x 0,5 cm ( white square on pictures is 1,0 x 1,0 cm)
Description:
VERY RARE SPECIES !
Sphenophyllum laurae
( Sternberg ) Zeiller!
Small specimen , rarer species of extinct vine liana-like, creeping
flower like
horsetail fossil
Sphenophyllum laurae
( Sternberg ) Zeiller
. Sphenophyllum
is a
genus of extinct plants that lived from the end of the Devonian Period to the beginning of the Triassic Period (about 360 to 251 million years ago); it is most commonly reconstructed as a shrub or a creeping vine.
Sphenophyllum
had a strong node-internode architecture, which has led some authorities to ally it with modern horsetails. Branches and leaves were arranged in whorls at each node much like the later
Calamites
; however, the leaves of
Sphenophyllum
were triangular in shape. Spore-bearing cones were also similar to those of
Calamites
and modern horsetails; however,
Sphenophyllum
lacked the hollow central stem that characterizes horsetail relatives because its tracheids, or water-conducting cells, were arranged in a central triangle surrounded by wood.
Sphenophyllum
grew in floodplain swamps, away from the margins of rivers.
Systematic:
Division:       Tracheophyta (Sphenopsida)
Class:           Equisetosidae
Order:          Equisetales
Family:         Calamitaceae
Genus:         Sphenophyllum Brongniart 1828
Species:
Sphenophyllum laurae
( Sternberg) Zeiller