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GINKGOPHYTA WOOD IN PETRIFIED FOREST OF THE UPPER TRIASSIC FROM RIO GRANDE DO SUL, BRAZIL. The anatomic analysis of an assemblage of silicified fossil wood fragments from the Santa Maria Formation, southern Paraná Basin, Brazil, led to the identification of parameters compatible with the morphospecies Baieroxylon cicatricum, registered and described here for the first time for the Brazilian Gondwana. The secondary wood is homogeneous, picnoxylic and characterized by the presence of growth zones. In the radial walls of the tracheids there are bordered pits in a predominantly uniserial arrangement. Typical spiral thickening is present in longitudinal radial and tangential sections. The rays are in a uniserial arrangement and homogeneous. The cross-field pits, one to four per crossfield, are inconspicuous, circular, small and randomly arranged. Phloem and cortex are unpreserved. A common pattern found on the external surface of the wood fragments corresponds to simple eye-shaped scars, which would correspond to branch connections, and hollow, double and triple eye-shaped scars in alternating arrangement, which would correspond to leaf insertions.

Lenhos de Ginkgophyta em florestas petrificadas no TriássicoSuperior sul-rio-grandense, Brasil