IDNAME urn:idName:fossilplants.info:species:BD900CE2-4294-88E3-6C39-90B1C4207AB5 species
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Ulmus woodii

Ulmus woodii Wheeler, Manchester Bull. Geosci., 82(4): 338. 31 Dec 2007
Name
Ulmus woodii
Rank
Species
Generic Name
[Genus] Ulmus
Authors (Pub.)
Wheeler E. A. Manchester S. R.  
Publication
Review of the wood anatomy of extant Ulmaceae as context for new reports of late Eocene Ulmus woods [2007/12]
Journal
Bulletin of Geosciences
Volume
82
Issue
4
Page number
338
Year
2007

Fossil Status
stems (wood)

Stratigraphy
Priabonian
Strat. comment
36.21 ± 0.26MA; lower part of the John Day Formation
Location
near Post, Oregon, USA
Paleoregion
America (North)
Data for Holotypus
Repository
Florida Museum of Natural History, Gainesville, USA
Repository Number
UF 24544
Diagnosis
Growth rings distinct. Semi-ring porous. Vessels solitary (rounded in outline) and in radial multiples of 2–3 in earlywood, closely spaced, earlywood zone broad, more than 2–3 earlywood vessels deep, with a gradual transition to latewood; latewood vessels in radial multiples and occasional clusters, diagonal arrangement at time tending to wavy tangential bands, tangential arrangement more obvious in wider growth rings. Mean tangential diameter of earlywood vessels 116 (21)–125 (21), range 60–160 μm. Perforations exclusively simple; intervessel pits crowded alternate, polygonal in outline, with included apertures. Vessel-ray parenchyma pits similar in size to intervessel pits, but with reduced borders. Vessel elements 274 (35)–332 (26) μm long. Thinwalled tyloses present, widely spaced. Axial parenchyma paratracheal, intermixed with vessel elements and vascular tracheids, usually 4 cells per strand. Fibers non-septate, pits not obvious, thick-walled; narrow elements with crowded alternate pits (likely vascular tracheids). Rays mostly 3–5 seriate, uniseriates not common; homocellular, composed of procumbent cells. Multiseriate ray height averages 402 (120)–667 (214), range 320–1200 μm, 5–7 per mm. Solitary prismatic crystals in chambered axial parenchyma strands, up to 12 chambers. Storied structure: narrow vessel elements / vascular tracheids, and axial parenchyma strands tending to be locally storied. Spiral thickenings not observed.

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