Figure 2 from: Ruiz-Domínguez C, Vovides AP, Sosa V (2019) Systematic relevance of pollen morphology in tribe Hylocereeae (Cactaceae). PhytoKeys 128: 121-140. https://doi.org/10.3897/phytokeys.128.35842

Figure 2 Quantitative and qualitative characters from pollen grains: A, B optical Microscope Photographs (800×) A polar view: Apocolpium (A), Mesocolpium (M), Equatorial diameter in polar view (EDP), Exine length (EL), Amb, Polarity, Symmetry, Aperture length, Polar Area Index (PAI) = A/EDP B equatorial view: Equatorial diameter (ED), Polar axis (PA), Pollen unit, Aperture (number, position, character), Pollen type, Shape class (PE) = PA/ED C scanning Electron Microscope Photograph (6000x); Exine Ornamentation, Spinule length (SL), Spinule base (SB), Perforation diameter (PD).