While compiling a plant inventory for a 20 acre forest fragment in Florida City, Miami-Dade County, Florida, on March 30, 2006, an unusual Thelypteris species was collected. The specimens did not correspond to any species reported from Florida (Wunderlin and Hansen, 2000). Using keys in Proctor (1989), Sánchez et al. (2006), and Morton (1963) it was tentatively identified as T. sancta (L.) Ching. A specimen was sent to Alan R. Smith, an expert on the genus, who confirmed this identification.