Values of GCF for T. vestitus could be underestimated, as modelled PN values used for calculation of GCF consider only one side of the leaf. In Styrax camporum, a Brazilian cerrado species with both vertically and horizontally oriented leaves, the former had higher PN than the latter (Habermann et al. 2008), and leaves where PN was measured with a transparent assimilation chamber showed high PN on both the adaxial and abaxial faces (Feistler and Habermann 2012). All of this suggests that the correction used by us using a vertical angle without considering light absorption by both faces throughout the day may have diminished calculated PN.