]> GH barcode-00310838 United States of America Alabama In fissures of Pottsville sandstone on West Fork of Sipsey River; 5 miles east of Double Springs Thelypteris burksiorum J. E. Watkins & D. R. Farrar J. E. Watkins & D. R. Farrar 2011-02-04 15:13:34 L. C. Crawford and C. B. Segars