Extremely rare PELTASPERM fossil plant early cycas ancestor Autunia Callipteris

Description

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Specimen:  Extremely rare only one fossil plant specimen - early cycas ancestor Peltaspermales !
Callipteris sp.
Locality:
Poland, GZW Upper Silesia Coal Basin
Stratigraphy:
Upper Carboniferous - Westphalian B - "Orzeskie" Beds
Age:
ca. 310 Mya
Matrix dimensions:
ca. 9,5 x 6,5 x 3,5 cm ( white square on pictures is 1,0 x 1,0 cm)
Description:
Her is an extremely rare Upper Carboniferous fossil  plant specimen - early cycas ancestor belonging to
Peltaspermales -
Callipteris sp.
Callipteris
is a widely used historical morphogenus for late Paleozoic ( mostly permian !!! ) foliage attributed to peltasperms.
By 30 years of collecting Pennsylvanian plant fossils I found only one - this Peltaspermales plant in Westphalian B layer ! This is one of the oldes Pertaspermales know to date!
The peltaspermales were initially described from Mesozoic based on associated foliage, pollen and seed- bearing parts ( Thomas, 1933; Harris 1937).
Today this enigmatic plants order incorporates specimens ranging from Pennsylvanian ( Kerp et al. 2001) to Triassic.
Many of them are know almost exclusively from Permian. There is not a great deal of detailed information known about the pollen organg of the peltasperms. In the more primitive forms , it appears that the polen organs are pinnately organized. At the present time , the Peltaspermales are perhaps the most confounding of all of plants. Moreover, the pollen organs assigned to Autunia bear bisaccate grains of the
Veicaspora
type, whereas those known from
Antevsia
are monosculate and conform to
Cycadopites
.