Epiphyllum Haworth

Pollen.

trizonocolpate, radially symmetrical, isopolar with circular contour in polar view. Shape: varies from oblate-spheroidal to prolate-spheroidal (P/E=0.90-1.06). Apertures: 3, colpate, large; polar area of medium size (PAI=0.32-0.46). Measurements: pollen grains large, (69.33)88.76(111.93) × (74.43)86.49(105.34) μm in equatorial view; exine thickness (2.24)2.73(3.67) μm . Ornamentation: smooth surface with tectum perforate, ornated with spinules of (1.22)1.69(2.02) μm length × (0.97)1.26(1.57) μm diameter in base; perforations (0.32)0.51(0.65) μm in diameter (Figure 3C).

Species examined.

Epiphyllum oxypetalum (DC.) Haw. (Guatemala, Sacatepéquez . C. Ruiz et al. 640 BIGU); Epiphyllum thomasianum (K. Schum.) Britton & Rose (Guatemala, Sacatepéquez . C.K. Horich 572922 MEXU).