Museum quality Acitheca fertile fossil tree fern frond with sporangia and spores

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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Rare, detailed fertile fossil fern:
Acitheca polymorpha
BRONGNIART
with beautifully preserved sporangia and spores - very rare coal age fossil plant !
Specimen:
Rare
fossil fern
Acitheca polymorpha
BRONGNIART
with detailed sporangia preserved !
Locality:
All accurate data will be provided with the specimen !
Stratigraphy:
Upper Carboniferous -  Stephanian A
Age:
c
a 302 - 299 Mya
Matrix dimensions:
ca 11,0 x 8,5 x 2,0 cm ( white square on pictures is 1,0 x 1,0 cm )
Description:
Beautiful specimen of fertile fern fossil
Acitheca polymorpha
BRONGNIART
with perfectly preserved sporangia showing amazing details.
Fructification (Latin:
fructificatio
) are the generative parts of the plant (flower and fruit) (as opposed to its vegetative parts: trunk, roots and leaves). Sometimes it is applied more broadly to the generative parts of gymnosperms, ferns, horsetails, and lycophytes, though they produce neither fruit nor flower.
The group "true ferns" includes foliage that have been shown to produce spores on the underside of their leaves. Some plants in this group were ground dwelling and others may have been epiphytes. Though most of the plants are treated as tree ferns and have been found to be related to an extand order of ferns called the Marattiales.
Today the Marattiales consist of two genera Angiopteris and Marattia.
Pecopteris
is derived from the Greek
pekin
, (to comb), and
pteris
, (a fern). This is because the leaflets of
Pecopteris
fronds are arranged like the teeth on a comb.
Systematic:
Division:         Trachaeophyta (Pteropsida)
Class:            Marattiopsida
Order:            Marattiales
Family:           Marattioids
Genus:           Pecopteris
Species
:
Acitheca polymorpha
BRONGNIART