河南固始下石炭统杨山组华夏木一新种

描述河南固始杨山煤矿下石炭统杨山组的一个华夏木新种Cathaysiodendronyangshanensesp.nov.,这是近年来继在甘肃靖远早石炭世臭牛沟组中发现华夏木之后该属在早石炭世地层中的又一发现。华夏木属是华夏植物群的特有分子,它在早石炭世的发现对探讨华夏植物群的起源有重要意义。

CATHAYSIODENDRON YANGSHANENSE SP. NOV. FROM THE EARLY CARBONIFEROUS YANGSHAN FORMATION OF GUSHI, HENAN

The genus Cathaysiodendron was proposed by Lee (1963). The chief characteristics of the genus are: leaf cushions separated by elevated strips which show more or less a zigzag appearance; leaf scars being almost the same shape and size as the cushions, with three cicatricules situated in the middle of the scar. The genus has been previously recorded from the late Carboniferous to Permian (Taiyuan and Shanxi formations) in North China, and the Late Permian (Longtan Formation) in south China (Lee, 1980). Recently we have received a number of specimens from the Early Carboniferous(the Yangshan Formation) of Gushi, Henan for identification, among which there are two representing a new species of Cathaysiodendron. This represents a new discovery of Cathaysiodendron from the Early Carboniferous in addition to Wang and Wu (2004) reporting Cathaysiodendron from the Early Carboniferous Chouniugou Formation in Jingyuan, Gansu. Considering the significance of Cathaysiodendron in the Cathaysian flora, we particularly report its occurrence from the Early Carboniferous. The figured specimens were collected from the Yangshan Coal Mine, Gushi, Henan Province, with catalogue number: YS-18, 19.