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 (A. Berger) Britton & Rose Pollen. trizonocolpate, radially symmetrical, isopolar with circular contour in polar view. Shape : prolate-spheroidal (P/E=1.06-1.07). Apertures : 3, colpate, large; polar area medium-sized (PAI=0.36-0.37). Measurements : pollen grains large to very large, (66.74)87.12(110.39) x (70.79)90.62(119.77) μm in equatorial view; exine thickness (2.19)2.68(3.39) μm . Ornamentation : smooth surface with tectum perforate, ornated with spinules of (1.09)1.58(2.07) μm length x (0.92)1.30(1.86) μm diameter in base; perforations (0.17)0.30(0.56) μm in diameter. Species examined. Selenicereus grandiflorus (L.) Britton & Rose ( Mexico , Veracruz. Rivera-Alarcon et al. 37 XAL); Selenicereus hamatus (Scheidw.) Britton & Rose ( Mexico , Veracruz. D. Jimeno-Sevilla 1079 XAL).