Plant very small, epiphytic, caespitose, up to 5 cm. 
high to the tip of the raceme. Roots fibrous, glabrous. 
Stems very short, about 1-2 mm. long, monophyllous, 
1-jointed, entirely concealed by two or three tubular 
imbricating searious evanescent sheaths. Leaf obovate- 
elliptic, cuneate-spatulate or oblanceolate, rounded or 
subacute at the apex, narrowed toward the base, up to 
15 mm. long and 6 mm. wide, coriaceous, apparently 
very fleshy in the fresh condition. Inflorescence usually 
solitary, two or three times surpassing the leaf. Peduncle 
up to the raceme filiform, about 2.38 em. long, provided 
with two remote inconspicuous tubular sheaths. Raceme 
distichous or secund, about 5- to 11-flowered, up to 1.8 
cm. long. erect or arcuate. Flowers minute, fleshy, pale 
greenish yellow, anther bright yellow. Sepals minutely 
and finely papillose on the inner surface. Lateral sepals 
connate to about the middle, about 1 mm. long, 1-nerved ; 
free portion asymmetrically round-ovate, acute (the col- 
lector’s notes say very obtuse and convex). Dorsal sepal 
much larger than the lateral sepals, sharply acute, 3- 
nerved, about 1.5 mm. long, connate with the lateral se- 
pals below; free portion ovate, about 1mm. wide. Petals 
minute, broadly cuneate, about 0.6 mm. long and sub- 
equally wide at the truncate apex, I-nerved, finely pube- 
scent on the apical margin. Lip minute, subrotund-flabel- 
late, about 0.5 mm. long and 0.7 mm. wide, broadly 
rounded above, apparently thickened along the apical 
margin and in the centre. Column minute, subglobose. 
A separate collection (¢m Thurn 154bis) shows a 
leaf 16.5 mm. long and a short 8-flowered inflorescence. 
Stelis perparva simulates S. guianensis Rolfe vege- 
tatively, but has smaller differently proportioned sepals. 
Bririsu Guiana, behind Manager’s House, Arakaka (Barima 
River). ‘‘..., which grows, not uncommonly, on the exposed ends of 
the twigs of small trees or large shrubs... Pollinia two, pear-shaped, 
[78 ] 
