Agujoxylon olacaceoides

Name

Agujoxylon olacaceoides

Rank

Species

Generic Name

[Genus] Agujoxylon

Authors (Pub.)

Wheeler E. A. Lehman T. M.  

Publication

Late Cretaceous woody dicots from the Aguja and Javelina Formations, Big Bend National Park, Texas, USA [2000]

Journal

IAWA Journal

Volume

21

Issue

1

Page number

101

Year

2000

Fossil Status

stems (wood)

Stratigraphy

Campanian

Strat. comment

Aguja Formation / Lower Shale Member

Location

Big Bend National Park, Texas, USA

Paleoregion

America (North)

Data for Holotypus

Repository

National Museum of Natural History, Smithsonian Institution, Washington, USA

Repository Number

USNM 507038 (GH 9/10-1)

Num

Fig. 8: A, E, F, I, L

Pub.

Late Cretaceous woody dicots from the Aguja and Javelina Formations, Big Bend National Park, Texas, USA [2000]

Data for Paratypus

Repository

National Museum of Natural History, Smithsonian Institution, Washington, USA

Repository Number

USNM 507039 (GH9), USNM 507040 (GH9-1), USNM 507041 (GH9-11), USNM 507042 (GH9-20), USNM 507043 (GH9-21), USNM 507044 (GH9-23), USNM 507045 (GH9-25)

Num

Fig. 8: C, G, H, J, K, M

Pub.

Late Cretaceous woody dicots from the Aguja and Javelina Formations, Big Bend National Park, Texas, USA [2000]

Diagnosis

Growth rings absent. Diffuse-porous; vessels solitary, occasionally in radial multiples; angular in outline, with a tendency to form radial iles; mean tangential diameters 68 (13)–92 (16) μm; mean radial diameters 93 (18)–124 (18) μm; 14–35 per mm2; mean vessel element lengths 1031 (212)–1192 (233) μm; perforation plates exclusively scalariform with more than 20 bars; intervessel pits opposite-scalariform; vessel-ray parenchyma pits with reduced borders, appearing of two sizes, some very enlarged nearly illing the entire cross-ield, and other pits smaller; thin-walled tyloses present, appearing to segment the vessel elements, on occasion bubble-like. Axial parenchyma abundant, apotracheal, diffuse-in-aggregates, of near equal abundance as the imperforate elements. In radial section, axial parenchyma and imperforate elements appear to alternate. Strand lengths of 12–14–19 cells. Rays: multiseriate portions generally 4–6 cells wide; multiseriate and uniseriate portions of the rays alternate; heterocellular, mixture of procumbent and square cells, without much distinction between the procumbent and square cells; variable in height within samples, sample means 990 (467)–1201 (650) μm; not storied; 5–14, mostly 9–11 per mm. Imperforate elements appearing to be fibre-tracheids (or tracheids), bearing distinct bordered pits in both radial and tangential walls. Inclusions: occasional 2- (rarely 4-)chambered crystalliferous cells within the longer axial parenchyma strands, each chamber containing a single prismatic crystal.