Pteridophyta的图像

描述：

Figure 7. Comparison of the pollen morphology of the three species of Cirsiumsect.Onotrophe in Taiwan. AC.tatakaense Y.H.Tseng & C.Y.Chang BC.kawakamii Hayata CC.arisanense Kitam.: 1 polar view 2 equatorial view 3 colporate view. Scale bar: 30 μm.