Boxplots showing quantitatively the variation in the size of the macro-ornamentation projections of the megaspores of I. gardneriana and I. panamensis sensu lato. In the proximal surface, the projects of the macro-ornamentation are narrower and shorter in I. gardneriana than in I. panamensis s.l. In the distal surface, the macro-ornamentation projections are slightly narrower and considerably shorter in I. gardneriana than in I. panamensis s.l..