摘要
在滇西保山上新统首次发现了黄背栎(Quercuspannosa)压型化石,并分析了角质层构造。其特征主要为:上表皮无气孔器,表皮细胞为不规则形五边形,垂周壁微弯曲,脉络为网格状,无毛基;下表皮具环列型气孔器,表皮细胞为不规则形五边形,垂周壁微弯曲,脉络为五边形的网格状,具毛基,毛的根部由多细胞组成,毛基部的细胞特化成辐射状。利用现存最近亲缘种(NLRspecies)原理,并比较化石和现生Q.pannosa角质层特征,推断上新世Q.pannosa在羊邑生长的古环境比现生Q.pannosa生存的冷湿气候相对干旱,且化石Q.pannosa为近原地埋藏。
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.
引文
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