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 sect. Hylocereus clade) Pollen. trizonocolpate, radially symmetrical, isopolar with circular contour in polar view. Shape : varies from suboblate to subprolate (P/E=0.86-1.18). Apertures : 3, colpate (brevicolpate in S. minutiflorus ), large (small in S. minutiflorus ); polar area medium-sized to large (PAI=0.30-0.59). Measurements : pollen grains of medium to very large size, (54.52)78.67(97.83) x (45.94)83.68(102.53) μm in equatorial view; exine thickness (1.66)2.95(4.10) μm . Ornamentation : smooth surface with tectum perforate, ornated with spinules ( S. minutiflorus and S. stenopterus without spinules) of (1.06)1.47(2.13) μm length x (0.72)1.23(1.53) μm diameter in base; perforations (0.20)0.39(0.89) μm in diameter ( Figures 3D , 3E , 3F , 3G , 3I , 3J , 4A , 4E , 4F ). Species examined. Selenicereus costaricensis (F.A.C. Weber) Britton & Rose (Colombia, Valle del Cauca. C. Ruiz et al. 555 CUVC); S. escuintlensis Kimnach (Guatemala, Escuintla. C. Ruiz et al. 635 BIGU); S. guatemalensis (Eichlam ex Weing.) Britton & Rose (Guatemala, El Progreso. M. Veliz et al. 20227 BIGU); S. minutiflorus Britton & Rose (Guatemala, Izabal. C. Ruiz et al. 627 BIGU); S. monacanthus (Lemaire) Britton & Rose (Honduras, Francisco Morazan . C. Ruiz et al. 493 TEFH); S. polyrhizus (F.A.C. Weber) Britton & Rose (Colombia, Valle del Cauca. C. Ruiz et al. 566 CUVC); Selenicereus sp. ( Mexico , Oaxaca. C. Ruiz et al. 608 XAL); S. stenopterus (F.A.C. Weber) Britton & Rose (Costa Rica, Alajuela. C.K. Horich s.n. MEXU); S. triangularis (L.) Britton & Rose ( Mexico , Yucatan . C. Gomez-Hinostrosa 2110 MEXU); S. undatus (Haworth) Britton & Rose (Colombia, Valle del Cauca. C. Ruiz et al. 560 CUVC).