Systematic relevance of pollen morphology in tribe Hylocereeae (Cactaceae) Author Ruiz-Dominguez, Catalina Author Vovides, Andrew P. Author Sosa, Victoria text PhytoKeys 2019 128 121 140 http://dx.doi.org/10.3897/phytokeys.128.35842 journal article http://dx.doi.org/10.3897/phytokeys.128.35842 1314-2003-128-121 E7F6A30F8981545BB28061827C26D30E 3378137 Kimnachia S. Arias & N. Korotkova Pollen. pantocolpate, radially symmetrical, isopolar with circular contour in polar view. Shape : prolate-spheroidal (P/E=1.07). Apertures : 15, brevicolpate, very large; polar area small (PAI=0.05). Measurements : pollen grains medium-sized to large, (43.95)49.14(55.73) x (48.04)52.45(58.32) μm in equatorial view; exine thickness (3.10)3.84(4.74) μm . Ornamentation : smooth surface with tectum perforate, ornated with spinules of (0.19)0.33(0.43) μm length x (0.34)0.45(0.55) μm diameter in base; perforations (0.09)0.18(0.35) μm in diameter ( Figure 4G ). Figure 4. 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. Gomez-Hinostrosa 2110) G Kimnachia ramulosa (L. Velasquez et al. 4884) H Pseudorhipsalis amazonica (E. Gudino 145) I S. alliodorus (A. Ruiz Velazco et al. 86) J S. glaber (C.K. Horich BGA 57239). Species examined. Kimnachia ramulosa (Salm-Dyck) S. Arias & N. Korotkova (Guatemala, Suchitepequez . L. Velasquez et al. 4884 BIGU).