Comparison of evaporation rate from Leucobryum glaucum cushions of different diameters in the field predicted from the conductance model over a 62 minute period. The average wind speed during the trial was 0.66 m/s. In the field, differences in boundary layer conductance are not expressed as predicted by the model. This difference is most likely due to shielding of moss cushions in the field by the forest boundary layer, not the moss canopy boundary layer as predicted.