中国西藏贝母兰属(兰科)新资料

New Data of Coelogyne(Orchidaceae) in Tibet, China

贝母兰属植物隶属兰科,多数种类具较高的观赏价值,但西藏自治区的贝母兰属植物资源考察不充分。本文报道了兰科贝母兰属植物1个中国未详知种:细茎贝母兰(Coelogyne mishmensis Gogoi);4个西藏新记录种:褐唇贝母兰(CoelogynefuscescensLindl.)、密茎贝母兰[Coelogynenitida(Wall.exD.Don)Lindl.]、疣鞘贝母兰(Coelogyne schultesii Jain et Das)、禾叶贝母兰(Coelogyne viscosa Rchb. F.)。其中,细茎贝母兰与流苏贝母兰(C. fimbriata Lindl.)极为相似,但细茎贝母兰花大,唇瓣边缘为厚绒毛状,与流苏状唇瓣相区别;褐唇贝母兰的近似种为云南贝母兰(C.assamica Linden&Rchb. f.)和斑唇贝母兰(C. fuscescens Lindl. var. brunnea Lindl.),但三者的界限划分不明确,通过搜索模式标本,从植株和花的形态、颜色看,本文报道的种更接近褐唇贝母兰原变种;密茎贝母兰近似眼斑贝母兰(C. corymbosa Lindl.),本研究提供鉴别特征将2种区分开;疣鞘贝母兰未在花期时,外观极易与黄绿贝母兰(C. prolifera Lindl.)混淆,但细微特征如鞘上具疣状突起,花唇瓣上具两条褶片等特征极易区别,本文提供了重要形态特征描述及详细特征图片等信息。该新记录的发现扩充了我国西藏自治区贝母兰属植物的记录,为今后兰科植物调查和保护研究提供新资料。

This research reports one little known species of Coelogyne(Orchidaceae) from China, C. mishmensis Gogo,and four new record species in Tibet, C. fuscescens Lindl., C. nitida(Wall. ex D. Don) Lindl., C. schultesii Jain et Das and C. viscosa Rchb. F. Among them, C. mishmensis and C. fimbriata Lindl. are very similar, but the flowers of C.mishmensis are large, and the edge of the lip flap is thick and hairy, which is different from the tassel-like lip. The similar species of C. fuscescens are C. assamica Linden & Rchb. f. and C. fuscescens Lindl. var. brunnea Lindl., but the boundary of the three is not clear. By searching for type specimens, from the morphology and color of plants and flowers, the species reported in this article is closer to C. fuscescen, and C. nitida is similar to C. corymbosa. This article would provide features to distinguish the two species. The appearance of C. schultesii that is not in bloom can easily be confused with C. prolifera,but subtle features such as warty protrusions on the sheath and two folds on the lips are easy to distinguish. Descriptions and photographs for diagnostic characters are provided. The discovery of the new records expands the records of Coelogyne Lindl. in Tibet and China, and would provide useful information for the study of Orchidaceae diversity and conservation.