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 (Hylocereus: Salmdyckia clade) Pollen. trizonocolpate, radially symmetrical, isopolar with circular contour in polar view. Shape : Prolate-spheroidal to subprolate (P/E=1.01-1.16). Apertures : 3, colpate, large; polar area medium-sized (PAI=0.30-0.40). Measurements : pollen grains large to very large, (81.09)89.11(127.4) x (83.13)98.23(129.26) μm in equatorial view; exine thickness (1.94)2.92(4.56) μm . Ornamentation : smooth surface with tectum perforate, ornated with spinules of (1.17)1.61(2.07) μm length x (0.81)1.20(1.53) μm diameter in base; perforations (0.23)0.46(0.70) μm in diameter ( Figure 3H , 4C , 4D ). Species examined. S. megalanthus (K. Schumann ex Vaupel) Ralf Bauer (Colombia, Valle del Cauca. C. Ruiz et al. 563 CUVC); S. ocamponis (Salm-Dyck) Britton & Rose ( Mexico , Michoacan . M. Chazaro 7334 MEXU); S. setaceus (Salm-Dyck ex DC) Ralf Bauer (Brazil, Rio de Janeiro. H. Bravo et al. 2755 MEXU).