以下为句子列表:
英文: The pollen grains of the genus are spheroidal, 8.9~ 9.7μm in diameter, usually -pores. The exine is -layers, .0~.μm in thick, and sexine thecker than nexine or almost equal. The ornamentation of exines are granulate, streaky and spinate.
中文: 本属花粉粒扁球形,大小为8.9~ 9.7μm,通常具 孔,外壁厚.0~.μm,两层,外层厚于内层或两层几等厚,表面具颗粒状、小刺状或条脊状纹饰。
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