ORCHIDACEiE 



tall.Pseudobulbs orange-yellow in dried specimens, rugose, about 

 1.5 cm. long, ±5 mm. in diameter at the base, when mature 

 partly concealed by the fibrous remains of sheathing bracts. Leaf 

 in the fresh state conspicuously three-nerved, when dry five- 

 nerved, 7-15 cm. long, 6-9 mm. wide, obtuse or subacute, apic- 

 ulate, attenuated at both ends, and at base contracted gradually 

 into a slender, sulcate petiole. Petiole 1.5-2.5 cm. long. Peduncle 

 slender, naked up to the raceme, including the raceme 12-20 cm. 

 long, variable. Raceme slender, drooping, curved, about 5 mm. 

 in diameter, 5-10 cm. long, many-flowered. Floral bracts slightly 

 exceeding the ovary and its pedicel, about 2 mm. long, sheath- 

 ing. Flowers small, about 2 mm. apart, yellow with brownish- 

 red center. Lateral sepals 3-3.75 mm. long, narrowly ovate-lan- 

 ceolate, acute, conspicuously one-nerved through the middle, 

 sUghtly concave, conduplicate at the apex. Dorsal sepal ±3 mm. 

 long, about 1 mm. wide near the base, lanceolate, acute, three- 

 nerved. Petals about 3 mm. long, narrowly oblong-lanceolate, 

 subacute or obtuse, margin obscurely denticulate. Labellum 

 about 3 mm. long, simple, obcuneate, apiculate, margin ob- 

 scurely, if at all, denticulate or minutely ragged fringed when 

 magnified, three-nerved, the lateral nerves branching; disc in 

 front of the column sHghtly concave with two large calU, one on 

 each side below the middle, confluent at base by a transverse 

 ridge. Gynostemium brownish-red, lateral appendages or stelidia 

 elhptical, basal, rounded, scarcely equaling the conspicuously tri- 

 dentate terminal wing. Rostellum prominent. 



In general appearance the plant recalls D. graciliscapuin 

 (Ames) Pfitz., but is clearly distinguished by the large elhptical 

 lateral wings of the column, which appear hke lateral lobes of 

 the simple labellum. Most closely allied to Dejidi^ockilum Jimbri- 



[46] 



