Platycerium ridleyi is a compact epiphytic staghorn fern in the family Polypodiaceae, native to the lowland forests of peninsular Thailand, the Malay Peninsula, Sumatra and Borneo. Its corrugated nest fronds (sterile fronds that clasp the support) have entire margins and conspicuous veins, measure 20 to 50 cm long, and overlap to form a rounded, cabbage-like mass that can enclose a whole branch. Ants often nest in the chambers between these fronds, and the species is frequently found together with ant ferns (Lecanopteris). Unlike most species in the genus, the stiff, leathery fertile fronds grow upward rather than hanging down, reaching 25 to 50 cm or more and forking like antlers, with an oval spore patch 5 to 17 cm long. Plants usually reach about 0.5 to 0.6 m tall and wide and grow slowly. It is closely related to Platycerium coronarium, which has pendulous fertile fronds. It is considered extinct in Singapore.
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