CYCAD WOOD FROM THE LOPINGIAN (LATE PERMIAN) OF SOUTHERN CHINA: SHUICHENGOXYLON TIANII GEN. ET SP. NOV.

Anatomically preserved wood collected from coal seam no. 1 of the Naluozhai coal mine in the Lopingian (Late Permian) Wangjiazhai Formation in western Guizhou Province, China, is documented and interpreted. The wood belonged to a trunk with an inferred diameter of 25 cm or more and consists of axial...

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Bibliographic Details
Published in:International Journal of Plant Sciences
Main Authors: Wang, Shi-Jun, He, Xiao-Yuan, Shao, Long-Yi
Format: Report
Language:English
Published: UNIV CHICAGO PRESS 2011
Subjects:
coal ball
fossil wood
new genus
cycads
GUIZHOU PROVINCE
FOSSIL PLANTS
GIGANTOPTERIDALES
ANTARCTICYCAS
AFFINITY
TRUNK
STEMS
SPERMOPTERIS
ARGENTINA
ANATOMY
Plant Sciences
Argentina
Antarc*
Online Access:http://ir.nigpas.ac.cn/handle/332004/19917
https://doi.org/10.1086/659454
Description
Summary:Anatomically preserved wood collected from coal seam no. 1 of the Naluozhai coal mine in the Lopingian (Late Permian) Wangjiazhai Formation in western Guizhou Province, China, is documented and interpreted. The wood belonged to a trunk with an inferred diameter of 25 cm or more and consists of axial tracheids and horizontal rays. Tracheids vary greatly in size, and small ones are usually irregularly arranged. Tracheid walls are 5-10 mu m thick and usually bilayered. There are usually biseriate araucarioides-type bordered pits on the radial tracheid walls. Two to five oval bordered pits are in each cross-field. Ray cells are thin walled, although thick-walled cells exist in some rays. Rays are quite variable in width and height. Uni- and partly biseriate rays are usually 2-20 cells high, while bi- and partly tri- to tetraseriate ones are 5-79 cells high. The cell size of rays is also quite variable and is usually larger than that of tracheids in the tangential direction. There are numerous leaf traces in the wood, and each of them extends horizontally through the wood within a broader ray. The last character is unique in known Paleozoic woods and leads to the establishment of Shuichengoxylon tianii gen. et sp. nov. The affinity of the wood with cycads, its implication in the evolution of cycad xylotomy, and its growth environment are discussed.

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