ceous. Sepals lanceolate or ovate-lanceolate, acuminate, 
3-nerved. Dorsal sepal up to about 6 mm. long and 2 mm. 
wide, concave. Lateral sepals up to about 5.8 mm. long 
and 1.6 mm. wide, lightly oblique, concave. Petals ob- 
liquely lanceolate, acuminate, 2- to 8-nerved at the base, 
up to about 5.1 mm. long and 1.8 mm. wide. Lip much 
smaller, 3-lobed near the base with the lateral lobes erect 
and parallel in natural position,about 2.6 mm.long; when 
expanded the lamina is oblong-ovate with a broadly eu- 
neate base; lateral lobes falcate-oblong, lightly incurved, 
rounded at the apex ; mid-lobe ovate-quadrate, about 1.7 
mm. long, broadly truncate with a pluridentate apex, 
coarsely dentate on each 
side; dise with a thickened 
mid-nerve and a pair of 
low keels extending from 
the base of the lateral lobes 
almost to the middle of the 
mid-lobe. Column lightly 
arcuate, dilated below, up 
‘| to about 2 mm. long. An- 
ther hemispherical, —in- 
cumbent, opercular, 2- 
celled. 
There appear to be no 
near allies of this species. 
1, lateral sepals, magnified about 5 Distinctive features are 
times. 2, dorsal sepal, magnified the small sessile leaves and 
about 5 times. 3, petal, magnified the small flowers with the 
5 cues. 4, ee from ae side, relatively long porrect lat- 
magnified about 5 times. 5, column wal ches ua deniate 
mid-lobe of the lip. 
and lip, magnified about 10 times. 
6, lip, magnified about 15 times. 
Brirish Guiana and northern Brazi_, summit of Mt. Roraima, 
flowers pinkish, November 28, 1927, G. H. H. Tate 425 (Tyrer in 
Herb. N.Y. Bot. Gard. ; Dupricare type in Herb. Ames No. 58323). 
[ 44 ] 
