Rare pre dinosaur fossil fern species Sphenopteris coemansi ANDRAE for Sale

Rare pre dinosaur fossil fern species Sphenopteris coemansi ANDRAE For Sale

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Rare pre dinosaur fossil fern species Sphenopteris coemansi ANDRAE:
$36.00

Specimen: RareSphenopteriscoemansi ANDRAE

Locality:Poland, GZW Upper Silesia CoalBasin

Stratigraphy: Upper carboniferous -Westphalian B/C-\"Orzeskie\"Beds

Age: ca 310 Mya

Matrixdimensions:ca 12,0 x 12,0 x 7,0 x 3,0cm

Description:

Specimenof sphenopterid seed fern Sphenopteris coemansi ANDRAE.Sphenopteridsferns like: Zeilleria,Discopterids, Uranopterids etc. were mostly aherbaceous\"seedsferns\"or were creeping, vine-like plants. Seed ferns (Pteridosperms) were group of seedplants from the Carboniferous and Permian periods (about 360 to 250 millionyears ago). Some, such as Medullosa, grew as upright, unbranched woody trunkstopped with a crown of large fernlike fronds; others, such as Mariopterids,were woody vines.All had fernlike foliage; however, they reproducedby seeds, with ovules and pollen organs attached to the fronds. Gamete - producingstructures in the seeds were surrounded by a hard inner integument and a fleshyouter layer. These features have led some authorities to speculate that theseseeds may have been dispersed by animals. Some seeds were large. ( Pachytestagigantea, a seed of Medullosa, grew up to 7 cm long.) Pollen organs of seedferns were also large and complex and were commonly made up of many pollen sacsfused into a large structure.

Systematic:

Genus:Sphenopteris (Uranopteris)

Species:Sphenopteris coemansi ANDRAE