Pinuxylon selmeierianum

Name

Pinuxylon selmeierianum

Rank

Species

Generic Name

[Genus] Pinuxylon

Authors (Pub.)

Dolezych M. Reinhardt L.  

Publication

First evidence for the conifer Pinus, as Pinuxylon selmeierianum sp. nov., during the Paleogene on Wootton Peninsula, northern Ellesmere Island, Nunavut, Canada [2019/12]

Journal

Canadian Journal of Earth Sciences

Annee/Jahrgang

2020

Volume

57

Issue

1

Page number

28

Year

2019

Fossil Status

stems (wood)

Stratigraphy

Paleogene

Location

Wootton Peninsula, northwestern Ellesmere Island, Nunavut, Canada [82°21=7.9==N 84°26=21.6==W, 64 m a.s.l (handheld GPS, horizontal error ±3 m)]

Paleoregion

America (North)

Data for Holotypus

Repository

Nunavut Palaeobotany collections, Canadian Museum of Nature, Ottawa, Canada

Repository Number

NUPB 650, intact piece of petrified trunk (Fig. 2F) and three thin sections taken from that trunk: NUPB 650a, cross section (Figs. 5A–5F); NUPB 650b, tangential section (Figs. 3, 6A–6C, 7A, 7C–7F); and NUPB 650c, radial section (Figs. 4, 6E, 6F, 8A–8C, 9A, 9C, 9E, 10C, 10E, 10F)

Num

Fig. 2F, Figs. 5A–5F, Figs. 3, 6A–6C, 7A, 7C–7F, Figs. 4, 6E, 6F, 8A–8C, 9A, 9C, 9E, 10C, 10E, 10F

Pub.

First evidence for the conifer Pinus, as Pinuxylon selmeierianum sp. nov., during the Paleogene on Wootton Peninsula, northern Ellesmere Island, Nunavut, Canada [2019/12]

Diagnosis

Growth rings: Coniferous wood with annual growth rings. Transition from earlywood to latewood is gradual. Tracheids: Earlywood tracheids are much wider than latewood tracheids. Bordered pits: Pits in radial cell walls of earlywood tracheids generally occur in a single vertical row, but in some places are distributed irregularly, and are usually flattened where in contact with each other. Apertures of pits are round. Axial parenchyma: Parenchyma is sometimes present. Rays: Uniseriate rays are up to 10 cells high. Multiseriate rays contain resin ducts and are up to 5 cells wide and 25 cells high. Horizontal and tangential ray cell walls are mostly thin-walled, but are sometimes thick-walled, and are mostly pitted, but sometimes smooth. Two or, less commonly, three pinoid cross-field pits in each cross-field. Ray tracheids are located at the margins of rays. Ray tracheid cell walls are mainly smooth, occasionally showing small dentations of Hudson gradation 3. Resin ducts: Vertical resin ducts are mostly surrounded by thin-walled tissue. Resin: Resin occurs in rays.