Dwarf, caespitose, epiphytic or lithophytic herbs, often forming mats on substrate. Rhizome creeping. Pseudobulb of one internode, globular, discoid or oblong, strongly depressed, reticulate or not. Leaves 1–4, inserted at the top of pseudobulbs, obovate-lanceolate, petiole tapering, subsessile, articulate. Inflorescence terminal, elongate, hysteranthous, proteranthous or synanthous, solitary, bearing one or a few flowers, peduncle filiform; floral bracts hooded, membranous. Flower white, pale green, or yellow. Dorsal sepal triangular, acuminate. Lateral sepals obliquely triangular, lanceolate, acuminate, forming a distinct mentum with column foot. Petals obovate-lanceolate or oblong, acuminate or blunt. Labellum entire or trilobed, with a claw, simple or adorned with ridges. Column with a curving column foot; pollinia eight, ovoid, compressed; rostellum truncate, almost square in outline. (PC, YN).
Species are trunk and branch epiphytes, growing among mosses and lichens, from 400 to 3000 m. Conchidium articulatum (Lindl.) S.Rauschert is recorded from tropical wet evergreen forest below 600 m in Sri Lanka; C. braccatum (Lindl.) Brieger from submontane and subtropical montane forests up to 1830 m in Sri Lanka; C. muscicola (Lindl.) S. Rauschert from warm temperate forests between 1500 and 1900 m in Nepal, as a lithophyte on damp, mossy, river-bed rocks in shade at 470 m in Sri Lanka, and up to 3000 m in Bhutan; and C. pusillum Griff. on mossy trunks of Viburnum L. (Adoxaceae) and Symplocos Jacq. (Symplocaceae) between 1980 and 2290 m in Sikkim. (PC, YN).