flexed, strongly convex, 3-nerved with a conspicuous 
supplementary lateral nerve. Dorsal sepal 3.5—4.8 mm. 
long, about 8 mm. wide near the base, narrowly ovate, 
obtuse, convex with the margin strongly reflexed. Petals 
about 1 mm. long, 1.5 mm. wide, shortly unguiculate, 
flabellate or transversely elliptical, very fleshy, conspicu- 
ously thickened above the middle, 3-nerved. Labellum 
1 mm. long, 1 mm. wide, fleshy, shortly unguiculate, 
rhombic in outline, with a transverse callus near the mid- 
dle, rounded at the apex, with the anterior half concave. 
Column fleshy, with a stigmatiferous lobe on each side 
at the summit. 
Cosra Rica, Peralta. A hot country form. Flowers greenish yel- 
low. May 1925. C.H. Lankester 1007. (Tyrer in Herb. Ames No, 30993.) 
