Caespitose epiphytic herbs up to about 80 cm. long. Stems slender, strict, covered with loosely appressed sheaths, the sheaths densely maculated with minute, purple, papillose or tuberculate excrescences. Leaves 1.5-6 cm. long and 0.3-0.6 cm. broad, linear or linear-lanceolate, borne near the apex of the stem. Inflores-cence exceeding the leaves, a densely flowered simple or branched raceme. Sepals 5-6 mm. long and 2.5-3 mmi. broad, oval, obtuse or obscurely apiculate. Petals 5-6 mm. long and about 1.5 mm. broad, elliptic-oblanceolate. Lip unguiculate; the claw adnate to the column; lamina 6-8 mm. long and 8-10 mm. broad, more or less orbicular in outline, 3-lobed, the lateral lobes deeply lacerate, often cut nearly to the middle of the lip, each lobe often 4-partite, mid-lobe deeply retuse, the lateral lobules denticulate or laciniate; disc provided with 2 small antrorse, submammillate calluses at the base.
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