SLOSSON, MARGARET. How Ferns Grow. Henry Holt & Co. New York. 1906. Out of print.
SMALL, JOHN K. Ferns of Tropical Florida. New York, 1918.
SMITH, JOHN. Historia Filicum. London, 1875. Amply illustrated, reliable.
STEP, EDWARD. Wayside and Woodland Ferns. F. Warne & Co. London, 1908.
TIDESTROM, IVAR. Elysium Marianum. Washington, D.C.
UNDERWOOD, LUCIEN M. Our Native Ferns and Their Allies. Henry Holt & Co. Edition 6. 1900. Valuable. Out of print.
WATERS, CAMPBELL E. Ferns. Henry Holt & Co. 1903. Out of print. Scarce.
WEATHERBY, C.A. Changes in the Nomenclature of the Gray's Manual of Ferns. Important article in the Rhodora of October, 1919.
WILLIAMSON, JOHN. Ferns of Kentucky. J.P. Morton & Co. Louisville, Ky. 1878.
Fern Etchings. J.P. Morton & Co. 1879. Both out of print.