<正>花粉外壁纹饰不易受环境因子的影响，为。植物基因型的外部表现，是研究植物分类演化的有效手段之一。用扫描电镜对山茶属红山茶组27种1变种植物花粉外壁纹饰特征进行观察，结果表明：红山茶组植物花粉粒的体积较大，规则花粉形状主要为长球形，某些种中存在不规则花粉。萌发孔均为三孔沟。山茶属红山茶组植物花粉外壁纹饰主要有皱沟状、皱波状、皱波状-颗粒状和颗粒状4种类型。不同种的花粉外壁纹饰存在一定差异，这些差异可为红山茶组种间分类及演化提供依据，同时也为某些种分类地位的确定和种系处理提供证据。

It is the base of the policy making and benefits allocation to evaluate the value of 1our resources of the scenic spots. The annual value of tour resources of the Dr. Sun Yatsen’s Mausoleum scenic spot has been estimated at 1.594 0 billion RMB by combining cx penditure method and contingent valuation method and its total present value is from 47.14 to 753.24 billion RMB on different assumes (at 3.50//00 of the discount rate). The authors consider that the tour value is provided with a high uncertainty. The characteristics, maior factors are tour person time, tour expenditure and time value. This paper points out that examining the relationship between the externality of the tour value and the assets value has tbe economic and policy implications.