ORCHIDACEiE 



13.25 mm. long, 9 mm. wide above the middle, about 3 mm. wide 

 near the base, obovate from a broad cuneate base, rounded at the 

 apex, apparently not undulated on the margin, nine-nerved. La- 

 bellum about 1 cm. long, conspicuously three-lobed, with a com- 

 paratively short claw, articulated with the column foot, fleshy 

 with coarse nerves. Claw 4 mm. long, 2.5 mm. wide near the mid- 

 dle, oblong, cuneate, five-nerved ; lateral lobes 7 mm. long and 

 wide, approximately 4 mm. wide where they join the main body 

 of the lip, erect, partly concealing the column, round-falcate or 

 orbicular, conspicuously nerved; middle lobe 5 mm. long, about 9 

 mm. wide, traversed longitudinally by about thirteen veins which 

 are conspicuous in dried material, rounded at the apex, not emar- 

 ginate nor thickened along the edge. Callus on the disc between 

 the lateral lobes tuberculate, corrugated, extending onto the claw, 

 4 mm. long, 2 mm. wide at the truncated apex. Column fleshy, 

 6 mm. long to the point of insertion of the upper sepal, produced 

 into a conspicuous foot. Pedicel and ovary 11 mm. long, slender. 

 Flowers in dried material of a deep brown color. Habit as illus- 

 trated. (Plate 113.) 



British Guiana, Schomhurgk 628. On rocks and trees. 



[55] 



