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Specimen:      Rare specimen of lower Carboniferous extinct horsetails - pteridophytes , rarer species: 

Sphenophyllum tenerrimum VON ETTINGSHAUSEN & Asterophyllites hagenensis FIEBIG & LEGGEWIE

Locality:         Poland, GZW Upper Silesia Coal Basin – Deatailed data will be send with speciemen

Stratigraphy:  Lower Carboniferous, Mississipian – Serpukhovian - Namurian A

Age:                 ca. 323 myo

Matrix dimensions:   ca. 12,0 x 8,5 x 2,0 cm ( white square on pictures is 1,0 x 1,0 cm )

                                  ca.  4,72" x 3,35" x 0,79" in ( white square on pictures is 0,39 x 0,39 in )

Description: 

Very rare , Flower like extinct horsetails / Pteridophyte: 

Sphenophyllum tenerrimum VON ETTINGSHAUSEN & Asterophyllites hagenensis FIEBIG & LEGGEWIE

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 tenerrimum VON ETTINGSHAUSEN