Key points are not available for this paper at this time.
John Roberts, Christine F. Pymar, J. S. Wallace, Rona M. Pitman, Seasonal Changes in Leaf Area, Stomatal and Canopy Conductances and Transpiration from Bracken Below a Forest Canopy, Journal of Applied Ecology, Vol. 17, No. 2 (Aug., 1980), pp. 409-422
Roberts et al. (Fri,) studied this question.