A late Eocene wood assemblage from the Crooked River Basin, Oregon, USA Author Wheeler, Elisabeth A. Author Manchester, Steven R. Author Baas, Pieter text PaleoBios 2023 2023-11-01 40 14 1 55 http://dx.doi.org/10.5070/p9401462457 journal article 10.5070/P9401462457 0031-0298 PLERANDREOXYLON WHEELER & MANCHESTER 2002 EMEND WHEELER , MANCHESTER , BAAS Emended diagnosis— Wood semi-ring-porous to ring-porous. Earlywood vessels in multiple rows, usually less than 100 µm in tangential diameter; latewood vessels in discontinuous wavy tangential bands or diagonal to oblique arrangement. Perforations simple or simple and scalariform with fewer than 20 bars; intervessel pits alternate to scalariform, medium to large in horizontal diameter; vessel-ray parenchyma pits with reduced borders to simple. Fibers septate or septate and non-septate. Axial parenchyma rare to scanty paratracheal. Rays multiseriate, less than 10-seriate and averaging less than 700 µm high, heterocellular, sheath cells occasionally present; uniseriate rays not common; fewer than 10 rays per mm. Crystals, oil/mucilage cells, storied structure, and radial canals absent.