SEM images of the microspore of Isoetes weberi (Herter 95840, US), I. quiririensis (Pereira 635, UPCB), I. maxima (Pereira 631, UPCB). A–C Microspore of I. weberi A Proximal view B Equatorial view C Distal view D–F Microspore of I. quiririensis D Proximal view E Equatorial view F Distal view G–I Microspore of I. maxima G Proximal view H Equatorial view I Distal view. All scale bars = 2 µm.