Epiphyte; pseudobulbs ovoid to orbicular, flattened or sometimes angular, 3-12 cm long, 3-9 cm wide, often purple-spotted, sometimes with large weathered bracts at base. Leaves 1-3 at apex of pseudobulb, narrowly oblanceolate to ligular, obtuse to subacute, 8-40 cm long, 3-12 cm wide, conduplicate and short-petiolate at base. Panicles 1 or 2, produced laterally from base of pseudobulb, much longer than leaves; flowers very flat, ca 2.5 cm diam; sepals subequal, 6-10 mm long, 3.5-5 mm wide, brownish-yellow, broader than sepals, 7-11 mm long, 5-9 mm wide, clawed at base, the blades suborbicular; lip trilobate, 1.5-2 cm long, the lateral lobes small, the center lobe deeply emarginate, 1.5-3 cm wide, the base of the lip with a fleshy, lumpy callus colored white with red spots, contracted into a short claw adnate to base of column; column 3-4 mm long, 3-winged at apex. Fruits not seen. Croat 6746, Woodworth & Vestal 529, 706. Infrequent, in the forest and on stumps at the margin of the lake. According to Allen (1949), once common in the valley of the Rio Chagres. Flowers usually in the early dry season (December to March), especially in February and March. Easily recognized by its more or less disk-shaped, often spotted pseudobulbs.