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) × (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 × (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 ( México, Veracruz. Rivera-Alarcón et al. 37 XAL); Selenicereus hamatus (Scheidw.) Britton & Rose ( México, Veracruz. D. Jimeno-Sevilla 1079 XAL).