CECOAL   02625
CENTRO DE ECOLOGIA APLICADA DEL LITORAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Anatomical features of some Miocene fossil woods from Solimões Formation, Amazon, Brazil
Autor/es:
ADRIANA CABRAL KLOSTER, SILVIA C. GNAEDINGER, KAREN ADAMI-RODRIGUES
Lugar:
Recife
Reunión:
Encuentro; I IAWA Pan American meeting; 2012
Institución organizadora:
UNESP
Resumen:
This paper describes the anatomy of a diverse assemblage of Miocene fossil woods from the Solimões Formation, Acre, Amazon, Brazil. The woods were collected at the Juruá and Envira rivers. The fossil woods are assigned to the families: Fabaceae (Caesalpinoideae, and Papilionoideae), Myrtaceae, Anacardiaceae and Humiriaceae. Two samples assigned to the Fabaceae have vessels that are solitary and in multiples, simple perforation plates, alternate and vestured pits, abundant paratracheal parenchyma that is vasicentric, aliform and confluent that is sometimes in large bands. Fibers have simple to minutely bordered pits, homogeneous rays that are 1-3 seriate in Caesalpinoideae and 1-2 seriate in the Papilionoideae. Both specimens of Fabaceae have storied rays structure. In Caesalpinoideae chambered crystals on parenchyma (one crystal by chamber). The sample assigned to the Anacardiaceae has vessels solitary and in multiples of 2-3-4, simple perforation plates, alternate pits with linear aperture, scarce axial parenchyma, rays 2-3 seriate, radial canals, and crystals in square marginal ray parenchyma cells with 1 crystal per cell, septate fibers and vasicentric tracheids. The fragment assigned to the Myrtaceae has exclusively solitary vessels, simple perforation plates, alternate pits, scanty paratracheal parenchyma, disjunctive axial parenchyma, heterocellular 1-3 seriate rays. The sample assigned to Humiriaceae has exclusively solitary vessels, scalariform perforation plates with 10- 20 bars, scanty paratracheal parenchyma, heterocellular rays, and fibers with distinctly bordered pits.Knowledge about this fossil wood assemblage is important because it contributes to our understanding of the history of the Amazon forest.