Platanoxylon cf. haydenii

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

publication ID 10.37520/fi.2021.022

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Platanoxylon cf. haydenii


Platanoxylon cf. haydenii (fELIX) SÜSS et MÜLL.-STOLL, 1977

Text-fig. 10a–h View Text-fig

M a t e r i a l. UF279-34469; UF 279-34470, minimum estimated axis diameter 30 cm.

D e s c r i p t i o n. Growth rings present, marked by slightly noded rays and 1–2 rows of radially narrow fibers. Wood diffuse-porous.

Vessels solitary and in short multiples, some tangentially arranged ( Text-fig. 10a, b View Text-fig ); average tangential diameter 76 (11) µm, range 59–96 µm; average 45/mm 2. Perforation plates exclusively scalariform, generally with fewer than 20 bars ( Text-fig. 10c, d View Text-fig ); intervessel pits opposite (Textfig. 10f, g), vessel-ray parenchyma pits not observed.

Fibers non-septate, pits not observed.

Axial parenchyma diffuse-in-aggregates, in interrupted short uniseriate lines ( Text-fig. 10a, b, f View Text-fig ).

Rays of two distinct sizes, larger rays often>20 cells wide ( Text-fig. 10a, b, h View Text-fig ), composed of procumbent cells, sometimes with 1–2 marginal rows of square cells; multiseriate ray height averages 3.05 mm, range 1.1– 5.53 mm.

R e m a r k s. Although vessel-ray parenchyma pits were not observed in these samples, their other characteristics indicate they are Platanoxylon (narrow numerous vessels, some in tangential multiples ( Text-fig. 10a, b View Text-fig ); scalariform perforation plates ( Text-fig. 10c, d, e View Text-fig ); opposite intervessel pits ( Text-fig. 10f, g View Text-fig ); diffuse-in-aggregates parenchyma; tall and wide rays composed mostly of procumbent cells ( Text-fig. 10h View Text-fig ). The characteristics that distinguish them from other woods with wide rays (e.g., Fagus and Euptelea ) were detailed by Scott and Wheeler (1982) and discussed earlier with reference to Fagus dodgei . Platanoid woods are common in the Paleogene of western North America. Woods similar to Platanoxylon haydenii are common in the older Clarno Formation, with multiple samples occurring at both the Nut Beds ( Wheeler and Manchester 2002) and Hancock Canyon ( Wheeler and Manchester 2014). These Post Hammer woods with their exclusively scalariform perforation plates are similar to other Eocene platanoid woods and differ from present-day Platanus woods that have both simple and scalariform perforation plates.

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