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Found from Mauritus, Madagascar, Seychelles, Assam, eastern Himalayas, lower India, Sri Lanka, Myanmar, Thailand, Malaysia Laos, Cambodia, Fujian, Guangdong, Guangxi, Guizhou, Hainan and Yunnan provinces of China, Hong Kong, Vietnam, Borneo, Java, Lesser Sunda Islands, Moluccas, Philippines, Sulawesi, Sumatra, Bismark Islands, New Guinea, Solomon Islands, Norfolk Island, New South Wales, and Queensland Australia, Fiji, New Caledonia, Samoa, Vanuatu, Wallis & Futna, Marquesas, Santa Cruz Islands, Caroline Islands, the Marianas Islands, Taiwan and the Ryukyu Islands as a medium to giant sized, warm to cool growing terrestrial in broadleafed, humid, primary forests in crevasses in karst limestone with rich humus soil in humid, shady conditions at elevations of 500 to 1500 meters with ovoid pseudobulbs carrying 3 to 6, ovate-lanceolate, to elliptic-lanceolate, plicate, prominently ribbed, long petiolate leaves that are pubescent beneath and blooms from a mature pseudobulb as a new one arises in the spring through fall on a minutely pubescent, 7′ [210 cm] long, racemose inflorescence with successive opening flowers that are congested at the apex and much longer than the leaves.