It had snow-melting-like veins on the surface of pollen grain with several hollows.
It had snow-melting-like veins on the surface of pollen grain with several hollows.
萌发孔沟多为3对（顶分体3条，侧分体各对应1条），以四面体几何中轴为中心，中心对称分布于四面体的3个侧面。
It had snow-melting-like veins on the surface of pollen grain with several hollows.
萌发孔沟多为3对（顶分体3条，侧分体各对应1条），以四面体几何中轴为中心，中心对称分布于四面体的3个侧面。