Gastrodia microchila (Orchidaceae, Epidendroideae), a new species from Brunei Darussalam

A new orchid species, <i>Gastrodiamicrochila</i> is described and illustrated. The species was found in a mixed dipterocarp forest in the Belait district, Brunei Darussalam, northern Borneo in 2024. It is distinct from most <i>Gastrodia</i> species in western Malesia by its small lip and column, and presence of the smooth cushion-like tissue on the inner side of lateral sepals. <i>Gastrodiamicrochila</i> is only the second species of <i>Gastrodia</i> recorded for Brunei Darussalam and the seventh known species for Borneo. A determination key for all <i>Gastrodia</i> species occurring in western Malesia is also provided.