Acriopsis Reinw. ex Blume

Epiphytic orchids that form bulky clumps with thin roots. Pseudobulbs small, crowded, globular to cylindrical, when young covered with white sheathing bracts. True roots spreading from base of pseudobulbs; aerial roots prominent, white, erect, branched, forming a tangled network around pseudobulbs. Leaves 2–4, narrow, apical on pseudobulbs. Inflorescence arising from base of pseudobulb, paniculate, wiry, arching. Flowers small, dull-coloured, turning yellow before falling. Dorsal sepal narrow. Lateral sepals fused on inner margins to form a synsepalum, projecting beneath labellum. Petals narrow, divergent. Labellum base decurrent on column to form tube, remaining lamina projecting out at right angles from column near its middle. Column with two narrow arm-like lobes and wings projecting behind anther like hood.

Hot, steamy, tropical lowland rainforest and swamp forest; sometimes extending to intermediate altitudes.