滇南风吹楠花粉形态观察

采用光镜、扫描电镜和透射电镜对滇南风吹楠的花粉形态进行观察.滇南风吹楠的花粉粒呈单粒存在,远极面观为椭圆形,近极面观大体为三角形,为不等极,两侧对称.花粉粒具一条远极单萌发沟;花粉大小为(15)19.90(21) μm×(20)22.50(25) μm.花粉粒外壁纹饰为网状,网脊平均宽度为0.29 μm;网眼形状不规则...

Pollen morphology of Horsfieldia tetratepala

Pollen grains of Horsfieldia tetratepala were examined by using light microscope(LM),scanning electron microscope(SEM)and transmission electron microscope(TEM).Pollen grains of H.tetratepala are boat-shaped,with a sulcate aperture on the distal face.The tectum is reticulate.The sizes of pollens are ranging from 1(15)9.90(21) μm×(20)22.50(25) μm.The exine of H.tetratepala could be distinguished into tectum,columella and foot layer.Foot layer is nearly one-half of the total exine thickness.Endexine is distinct and varies in thickness.Intine can be distinguished into 3 layers.The exine elements(tectum,columella and foot layer)are reduced gradually to a thin foot layer in the colpus area.The pollen characters are basically consistent in Horsfieldia,while some differences exist among different Asian genera,which indicates the definite classification of Horsfieldia.