隐翼科花粉形态的研究

POLLEN MORPHOLOGY OF CRYPTERONIACEAE

报道了隐翼科Ｃｒｙｐｔｅｒｏｎｉａｃｅａｅ花粉形态及其外壁超微结构，并与广义的隐翼料其它属的花粉进行比较。研究表明，该科的隐翼属Ｃｒｙｐｔｅｒｏｎｉａ以长椭圆形的极面观、近乎四棱形的赤道面观，２孔沟的萌发孔和较厚的外壁内层明显地区别于其它属的花粉。如Ａｘｉｎａｎｄｒａ属、Ｄａｃｔｙｌｏｃｌａｄｕｓ属和Ｒｈｙｎｃｈｏｃａｌｙｘ属的花粉为圆六角形（极面观），具３孔沟和３假沟；Ａｌｚａｔｅａ属花粉为圆三角形（极面观），具３孔沟。此外，这４个属的花粉均具有薄的外壁内层，花粉较大，为Ｃｒｙｐｔｅｒｏｎｉａ属花粉的２倍以上。孢粉学主持把隐翼科作单模式科处理，即只包括隐翼属，不宜包括其它４个属。

The pollen of Crypteroniceae was examined with LM,SEM and TEM,and a compari-son was made between Crypteronia and the other four related genera : A xinandra, Dactylocladus,Rhynchocalyx and Alzatea The result showed that the pollen grains of Crypteronia are different remarkablly from those of other four genera by having eiliptic shape in polar view and neady tetragonal shape in eq uatorial view, dicolporate, syncolpate, with two endoapertures situated at the opposite ends of the long equatorial axis, the pollen wall consists of thick endexine(2.5-3μm)and very thin foot layer(less than 1μm) in Crypteronia. The pollen grains of Axinandra, Dactylocladus and Rhynchocalyx are round dexangular shape in polar view,3-colporate and 3-pseudocolpi, while the pollen in Alzatea is round triangular shape in polat view,3-colporate. The pollen grains of these four genera have thin endexine in wall composition(less than 1μm).Palynology supports to treat the Crypteroniceae as a monotypic family,i.e., only including Crypteronia.