物参属花粉形态及其分类学意义

首次报道了兰科的手参属Ｇｙｍｎａｄｅｎｉａ国产５种植物花粉形态的研究结果，并与邻近的兜被兰属Ｎｅｏｔｔｉａｎｔｈｅ花粉进行了对比研究。前者花上块形状大多不规则，少数为三棱体形；而后者花粉小块大多形状为三棱锥体形，少数形状不规则。手参属花粉外壁表面具很细微的小穿孔、皱波状，小穴和小穿孔与沟渠状纹饰共存，或沟渠状等。而兜被兰属外壁表面纹饰明显，具有５种类型：（１）小穿孔，（２）表面近光滑，（３）沟渠状

Pollen morphology of Gymnadenia R. Br.(Orchidaceae) and its taxonomic significance

WT5BZ] Pollen morphology of five species from China in the genus Gymnadenia R. Br.(Orchidaceae) was investigated in this work. Pollen characteristics of this genus were compared to those of its closely related genus, Neottianthe Schltr. It is found that there are some differences of pollen morphology between the two genera, e.g.: (A) Pollen massulae are mostly irregular less frequently trigonous conical in Gymnadenia, while mainly trigonuus conical less frequently irregular in Neottianthe; (B) Ornamentation of pollen exine surface is usually indistinct, but microperforate, microrugulate, microfoveolate or both microperforate and microfossulate in high magnification in Gymnadenia, but more distinct in Neottianthe. Exine ornamentation of this genus can be divided into five types, (1) almost smooth, or very obscurely fosset, (2) perforate, (3) fossulate or foveolate, (4) reticuloid, (5) typically reticulate. (C) the surface of pollen massulae in Gymnadenia possess viscin thread, but that in Neottianthe does not. The result of this work supports the separation of Neottianthe from Gymnadenia as an independent genus. WT5HZ]