Acer Post Hammer sp. 1

Wheeler, Elisabeth A. & Manchester, Steven R., 2021, A Diverse Assemblage Of Late Eocene Woods From Oregon, Western Usa, Fossil Imprint 77 (2), pp. 299-329 : 320-322

Acer Post Hammer sp. 1

Text-fig. 11a–e

M a t e r i a l. UF 279-34456 (minimum estimated diameter 12.5 cm).

D e s c r i p t i o n. Growth rings distinct, marked by radially flattened fibers. Diffuse-porous ( Text-fig. 11a, b ). Vessels solitary (57 %) and in radial multiples of 2(–3); average tangential diameters 40 (SD = 10), range 24–63 µm; vessel frequency 50–56/mm 2; perforations exclusively simple ( Text-fig. 11d ); gum deposits appear accumulated at ends of vessel elements ( Text-fig. 11e ); intervessel pits crowded alternate, mostly polygonal in outline with included apertures ( Text-fig. 11c ), small to medium; vesselray parenchyma pits similar in size and shape to intervessel pits; helical thickenings present along entire length of the vessel element ( Text-fig. 11d ).

Fibers non-septate, walls thin to medium, pitting not observed.

Axial parenchyma marginal. ( Text-fig. 11a, b ).

Rays 1–3(–4)-seriate ( Text-fig. 11e ). Homocellular, composed of procumbent cells; multiseriate ray height averages 238 (69) µm; 8–10 /mm.

Storied structure absent; crystals not observed.

Figures

Text-fig. 11. Acer Post Hammer species 1, UF 279-34456. a, b: Diffuse-porous wood with distinct growth rings, marked by marginal parenchyma, vessels solitary and in short radial multiples, TS. c: Crowded alternate intervessel pits, TLS. d: Simple perforation plates, helical thickenings in vessel elements, TLS. e: Rays 2–3-seriate, gum deposit in vessel element, TLS. Acer Post Hammer species 2. UF279-34466. f: Diffuse-porous wood with distinct growth rings, marked by marginal parenchyma, vessels solitary and in short radial multiples, TS. g: Alternate intervessel pits, helical thickenings in vessel elements, TLS. h: Rays 1–4(–5)-seriate, TLS. i: Crystalliferous strand, multiseriate ray, TLS. Trochodendron beckii, UF 279-24558. j, k: Distinct growth rings, abrupt transition from earlywood to latewood, vesselless, wide raysnoded atgrowth ring boundaries, TS. l:Rays of two distinct sizes, uniseriate and multiseriates>10-seriate, TLS. m. Scalariform intertracheary pits. RLS. Scale bars: 500 µm in j; 200 µm in a, f, k, l; 100 µm in b, h; 50 µm in c, d, e, g, i, m.