Pollen grains of tribe Hylocereeae (Scanning Electron Microscope photographs). A–D: Left polar view, right equatorial view A S. undatus (C. Ruiz et al. 560) B Weberocereus tunilla (C.K. Horich BGA 58344) C S. setaceus (H. Bravo et al. 2755). D–J: left polar view, left details of spinules and perforations D S. megalanthus (C. Ruiz et al. 563) E S. stenopterus (C.K. Horich s.n.) F S. triangularis (C. Gómez-Hinostrosa 2110) G Kimnachia ramulosa (L. Velásquez et al. 4884) H Pseudorhipsalis amazonica (E. Gudiño 145) I S. alliodorus (A. Ruiz Velazco et al. 86) J S. glaber (C.K. Horich BGA 57239).