中国凤尾蕨属(凤尾蕨科)的孢粉学与叶表皮形态学研究

Studyon spore and leaf epidermis morphology of Pteris ( Pteridaceae ) from China

对中国凤尾蕨属44个分类群进行孢粉学与叶表皮形态学研究。结果表明:在属的水平,该属的孢子形态稳定。根据赤道环的有无和脊类纹饰的情况,该属可划分成6种类型。但这与该属的孢子体形态不相关。在属和种的水平,该属的气孔器类型均具有较高的稳定性,大部分种类以极细胞型和腋下细胞型为主。气孔器密度、面积、长宽比这3个定量特征在属和种的水平上稳定性都较差,因此不具有分类学价值。基本气孔器类型在种间重复性较高,可作为该属稳定的形态特征之一,在属的水平上具有一定的分类学价值,但不宜作为该属属下的分类学依据。综合两方面的数据,对部分疑似种进行初步的分类学处理,并探讨了易混淆种的分类学关系。

Forty-four taxa in Pteris（Pteridaceae） from China were selected for spore and leaf epidermis morphology studies. Spore morphology is stable at the genus level. Pteris can be divided into six groups based on the equatorial flange and lophate ornamentations. However,its spore morphology is not consistent with its sporophyte morphology. Stoma types are quite stable at the genus level and the species level. Polocytic type and axillocytie type are the prima- ry stoma types for most Pteris species. However, stoma density, size and length to width are unstable at the genus level and the species level. So they are valueless for taxonomy. Due to the high repeating frequency in Pteris, primary stoma types are less valuable for species delimitation than for genus delimitation. Based on these, systematic relations of confusing species are discussed.