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American Fern Society American Fern Society We promote interest in the cultivation conservation and study of ferns. The American Fern Society was established in 1893 with the objective of fostering interest in ferns and lycophytes or pteridophytes. Today we recognize pteridophytes as including two distinct lineages of vascular land plants the lycophytes which include the quillworts family Isoetaceae spike mosses family Selaginellaceae and club mosses family Lycopodiaceae and the ferns which includes the horsetails family Equisetaceae whisk ferns family Psilotaceae and the 10000 species traditionally considered to be ferns. With over 500 members globally the American Fern Society is one of the largest international fern clubs in the world.