RARE extinct horsetail Sphenophyllum fossil cone Sphenophyllostachys For Sale
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RARE extinct horsetail Sphenophyllum fossil cone Sphenophyllostachys :
$26.00
My specimens are gunine and will be delivered with a "Certificate of authenticity, age and origin" and scientific papers allowing plant identification !
I combine shipping costs. Each item is different, sopleasewait with payment after purchase-I will send You a combine invoice. Usually, it will be cost of shipping the heaviest item.
Specimen: Rare extinct Pteridophyte Sphenophyllum cone:Sphenophyllostachys sp.
Locality: All detailed and accurate data will be provided with the specimen
Stratigraphy: Lower Carboniferous, Mississipian – Serpukhovian - Namurian A
Age:ca. 330 Mya
Matrixdimensions: ca. 8,0 x 8,0 x 2,0 cm ( white square on pictures is 1,0 x 1,0 cm)
Description:
Sphenophyllumis agenus 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. Sphenophyllumhad 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 Sphenophyllumwere triangular in shape. Spore-bearing cones were also similar to those of Calamitesand modern horsetails; however, Sphenophyllumlacked the hollow central stem that characterizes horsetail relatives because its tracheids, or water-conducting cells, were arranged in a central triangle surrounded by wood. Sphenophyllumgrew in floodplain swamps, away from the margins of rivers.
Systematic:
Class: Equisetosidae
Order: Equisetales
Family: Calamitaceae
Genus: Sphenophyllum
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