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Platycerium (stag's-horn ferns; family Polypodiaceae) A genus of ferns which have naked superficial sori on erect, forked, antler-like, fertile fronds. Sterile, broadly oval or rounded fronds bend down over the rhizomes and help to trap humus beneath them. They are epiphytes of tropical rain forests, with 17 species, found mainly in the Old World.