A new orchid species from southern Thailand, Aphyllorchisperiactinantha, is described and illustrated. The novelty is characterized by the subactinomophic flowers, the concave labellum, not divided into hypochile and epichile, the reduced staminodes, the shallowly bilobed stigma and the semicircular rostellum. A key to the species of Aphyllorchis in Thailand is updated.
Keywords: Epidendroideae; Thai-Malay Peninsula; Ton Nga Chang Wildlife Sanctuary; achlorophyllous orchid; dipterocarp forest; peloric flower.
Amonrat Chantanaorrapint, Sahut Chantanaorrapint.