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Callipterid pteridosperms from the Early Permian of Ukraine

100%

Boyarina N.

Acta Palaeontologica Polonica

1994

tom 39

nr 1

117-133

In terrigenous rocks of the early Permian age, below the limestone P6, of the Western Donets Basin two new pteridosperm species have been identified. One of them had phyllosperms with seed scars situated near the base and in the middle part of a pinnule, at the ends of vein-like off-shoots. Its foliage consists of dichotomously branched pinnate to tripinnate fronds, sphenopteroid pinnules and intercalary pinnae and pinnules. The foliage is very variable. Immature, semi-mature, and mature pinnae and pinnules are known. These plants grew probably along the margins of floodplain lakes. The name Raminervia mariopteroides gen. et sp. n. is proposed here for them. The second species, Dichophyllum cuneata sp. n., is characterized by pinnate to bipinnate fronds with a dichotomy of the primary rachis, broadly wedge-shaped pinnules and similarly shaped intercalary pinnules. Plants of the species probably grew on elevated lots of the floodplain and on the alluvial-lacustrine plain.

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1 Acta Palaeontologica Polonica

1 Boyarina N.

1 1994

Wyniki wyszukiwania

Callipterid pteridosperms from the Early Permian of Ukraine