中国丝瓜藓属直蒴组的分类学研究

采用经典分类学研究方法,对河北师范大学植物标本馆(HBNU)等国内多个标本馆保存的中国丝瓜藓属直蒴组(Pohlia Hedw.section Cacodon Lindb.ex Broth.)及其近缘类群植物标本共计130余号进行了分类学分析鉴定,并对所确定的中国产直蒴组物种的芽胞大小、形状及叶原基数量和长度等形态学特征进行比较分析,以期为中国丝瓜藓属直蒴组的分类学研究提供理论依据。结果表明:(1)经鉴定中国丝瓜藓属直蒴组植物共有8种——夭命丝瓜藓[Pohlia annotina(Hedw.)Lindb.]、糙枝丝瓜藓[P.camptotrachela(Ren.Card.)Broth.]、林地丝瓜藓[P.drummondii(Müll.Hal.)Andr.]、疣齿丝瓜藓[P.flexuosa Harv.]、纤毛丝瓜藓[P.hisae T.J.Kop.et J.X.Luo]、异芽丝瓜藓[P.leucostoma(BoschSande Lac.)M.Fleisch.]、念珠丝瓜藓[P.lutescens(Limpr.)H.Lindb.]和卵蒴丝瓜藓[P.proligera(Kindb.ex Breidl.)Lindb.ex Arnell]。(2)中国丝瓜藓属直蒴组植物的重要鉴别特征是在假根或叶腋处生有芽胞,而且芽胞形状以及叶原基形状和数量在直蒴组中存在差异,如念珠丝瓜藓具有假根生芽胞,而疣齿丝瓜藓具有两型芽胞。(3)对所鉴定的中国丝瓜藓属直蒴组8种植物的识别特征、生境及其与相近种的关系进行了详细描述,并绘制了形态特征墨线图。

A Taxonomic Revision of Pohlia Hedw. Section Cacodon Lindb. ex Broth. (Mielichhoferiaceae) in China

Using classical taxonomic method, 130 specimens, which were deposited in HBNU and other native herbariums, belonging to Pohlia Hedw. section Cacodon Lindb. ex Broth. and its related groups were studied. The propagules of the eight propaguliferous species of Pohlia Hedw. section Cacodon in China were compared with the size, shape, quantity and length of leaf primordia. Results showed that: (1) the checklist of Pohlia Hedw. section Cacodon in China was updated, which including eight species: Pohlia annotina (Hedw.) Lindb., P. camptotrachela (Ren. & Card.) Broth., P. drummondii (Müll. Hal.) Andr., P. flexuosa Harv., P. hisae T. J. Kop. et J. X. Luo, P. leucostoma (Bosch & Sande Lac.) M. Fleisch., P. lutescens (Limpr.) H. Lindb., and P. proligera (Kindb. ex Breidl.) Lindb. ex Arnell. (2) As the features of propagules growing in rhizoid or axillae play important roles in identification, the shape of propagules and the quantity and shape of leaf primordial in Pohlia Hedw. section Cacodon Lindb. ex Broth. were significantly different, such as P. lutescens (Limpr.) H. Lindb. has toruloid propagules growing on the rhizoids, P. flexuosa has two different types of propagules. (3) The taxonomic features, habitat and characteristic comparison of related species are described in detail. Meanwhile, ink drawing of eight species of Pohlia section Cacodon were made. This study provided taxonomic evidence of the identification of Pohlia Hedw. section Cacodon Lindb. ex Broth. in China.