Cuticular structure of {\sl Quercus pannosa Hand.--Mazz. from the pliocene in Baoshan, Yunnan Province and its palaeoenvironmental significance
Cuticular structure of {\sl Quercus pannosa Hand.--Mazz. from the pliocene in Baoshan, Yunnan Province and its palaeoenvironmental significance
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发表时间：
2006
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通讯作者：
Liang Xiao;Bainian Sun;De-Fei Yan;S. Xie;Lijie Wei
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作者：
Liang Xiao;Bainian Sun;De-Fei Yan;S. Xie;Lijie Wei
在滇西宝山地区发现了上新世番栎化石的压缩化石，并对其表皮结构进行了详细的分析。表皮特征如下：上表皮无气孔，细胞由不规则到五边形，细胞背斜壁微弯曲，脉状取消，无毛状基部；下表皮气孔环状，细胞由不规则变为五角形，细胞背斜壁微弯曲，脉状五角形取消，毛基部由多细胞毛足和径向毛基细胞组成。根据最近亲缘种原则对化石与现存白斑栎的角质层结构进行比较，认为白斑栎化石生活的上新世杨邑地区的古环境比现存白斑栎生活的寒冷湿润气候更为干旱，白斑栎化石为近埋地气候。
The compressions of fossil Quercus pannosa were found from the Pliocene in Baoshan, Western Yunnan and the cuticular structure of Quercus pannosa was carefully analyzed. The epidermal characteristics are as follows: no stomata in upper epidermis, cells from irregularity to pentagon in shape, cell anticlinal walls slightly curved, venation cancellate, no trichome base; stomata cyclocytic in lower epidermis, cells from irregularity to pentagon in shape, cell anticlinal walls slightly curved, venation pentagonal cancellate, the trichome base consisting of multicellular trichome foot and radial trichome basal cells. The comparison of cuticular structure between fossil and extant Q. pannosa based on the principle of the nearest living relative species suggests that the palaeoenvironment of Yangyi where fossil Q. pannosa lived in Pliocene is more arid than the cold-humid climate in which extant Q. pannosa lives and the fossil Q. pannosa is of near burial in situ.