The surface of pollen massulae is characterized white viscous secretion.The type and size of the hybrid F1 pollen grains are similar to one of the parents or remain with the transitional types.

• 乌天麻和以乌天麻为母本的杂种其花粉为花粉块类型，红天麻和以红天麻为母本的杂种花粉包括四合花粉类型和花粉块类型，杂种后代花粉类型和花粉块大小与某一亲本相似或为亲本的过渡类型。