I am not completely confident in this det. When using the key by A. M. Evans (in Interspecific relationships in the Polypodium pectinatum-plumula complex, Ann. Missouri Bot. Gard. 55(3): 193-293 [1969]) I end up at what are now Pecluma truncourm and P. sicca (Lindm.) M.G. Price. Based on collections at FLOR, P. sicca appears to be a much smaller plant compared to the collection below and specimens of P. truncourm.