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 Selenicereus (ex Weberocereus) Pollen. trizonocolpate to pantocolpate, radially symmetrical, isopolar with circular or convex-quadrangular contour in polar view. Shape : prolate-spheroidal (P/E=1.04-1.12). Apertures : 3 or 12, brevicolpate to colpate; polar area medium-sized to large (PAI=0.41-0.60). Measurements : pollen grains large to very large, (50.9)77.50(100.2) x (66.79)82.21(100.86) μm in equatorial view; exine thickness (2.29)2.96(3.77) μm . Ornamentation : smooth surface with tectum perforate, ornated with spinules of (1.12)1.48(1.82) μm length x (1.13)1.44(1.91) μm diameter in base; perforations (0.17)0.29(0.50) μm in diameter ( Figure 4I , 4J ). Species examined. Selenicereus alliodorus ( Mexico , Oaxaca. Gomez-Hinostroza & H. M. Hernandez ) S. Arias & N. Korotkova (A. Ruiz Velazco et al. 86 MEXU); S. glaber (Eichlam) G.D. Rowley (Guatemala, Sacatepequez . C.K. Horich BGA 57239 MEXU).