Gomortegoxylon patagonicum

Name

Gomortegoxylon patagonicum

Rank

Species

Generic Name

[Genus] Gomortegoxylon

Authors (Pub.)

Nishida M. Nishida H. Ohsawa T.  

Publication

Comparison of the petrified woods from the Cretaceous and Tertiary of Antarctica and Patagonia [1989/9]

Journal

Proceedings of the NIPR Symposium on Polar Biology

Volume

2

Page number

200

Year

1989

Fossil Status

stems (wood)

Stratigraphy

Chattian

Strat. comment

Mina Chilena Formation

Location

Cerro Dorotea, Ultima Esperanza, Chile

Paleoregion

America (South)

Data for Holotypus

Repository

Chiba University, Faculty of Science, Laboratory of Phylogenetic Botany, Chiba, Japan

Repository Number

797741

Num

Fig. 1, Plates 1, 2 A, B

Pub.

Comparison of the petrified woods from the Cretaceous and Tertiary of Antarctica and Patagonia [1989/9]

Diagnosis

Growth rings discernible by 1-8 layers of radially compressed wood fibers and decreasing pore sizes, 1580-2220 ym, average 2112m in width. Wood diffuse porous; pores scattered evenly throughout the increment, 76-163, average 118, pores per square mm, usually solitary (88.0%), 2-3 in multiple (3.0%), in couple (7.7%) or rarely in cluster (1.2%), circular to elliptical in outline in cross section, 20-52 wm, average 32 wm, in tangential and 20-74 ym, average 42 ym, in radial diameters. Vessel segment length unmeasurable; end walls steeply inclined and elliptical in outline; perforation plates scalariform bearing 10-30, rarely up to 68, cross bars, and sometimes more or less inclined to make reticulate perforation. Intervessel pits usually scalariform, sometimes elongate-elliptical and oppositely arranged, 4-26 ym and 2-4 ym in horizontal and vertical dimensions respectively; pits apertures elliptical or slit-like; tyloses not abundant; lacking spiral thickenings. Wood fibers filled among vessels.and rays, comprising ground tissues, 12-34 4m X 8-22 wm in radial and tangential diameters in the early wood, 4-10 wm X 8-20 wm in the late wood, and sometimes regularly arranged in radial rows; walls 2-8 4m in thickness; not septate. . Wood parenchyma not clearly discernible in cross section, but probably apotracheal and diffuse. Rays 4-11, average 7, in number per 1mm, heterogeneous, types I A and II B of Kribs, uni- (30.8%), bi- (15.7%), tri- (35.1%) and quadriseriate (18.5%). Uniseriate rays usually 1-9 cells or 67-380 ym, rarely up to 12 cells or 618 ym in height. Multiseriate rays 5-34 cells or 160-820 wm in height, often bearing uniseriate wings, usually less than 4 cells (79.8%), sometimes 4-6 cells (16.2%), rarely up to 13 cells (4.1%) in height. Rarely two rays are fused to make a fused ray which is up to 38 cells or 1007 ym in height. Uniseriate portions of rays consist usually of upright and square cells, 40-100 um in height, 8-20 ym in width and 12-24m in length. Multiseriate portions of rays consist of procumbent cells only, 12-24m in height, 4-10 ym in width and 34-206 m in length. Ray-vessel pits scalariform or sometimes oppositely arranged elliptical or oval, 4-26 4m in horizontal and 2-8 »m in vertical dimensions. Ray cells of uniseriate portion sometimes contain yellowish globular contents.