filament of anther; lateral sepals divaricate, more or less arcuate, 
adnate to sides of column-foot and with it form a short sac 
which is adpressed to the ovary. Petals oblique, arcuate, aggluti- 
nate with dorsal sepal, oblique at base. Lip uppermost, sessile, 
rhombic in outline, cuneate at base with thickened margins. 
Column horizontal, slender, puberulent in front, somewhat 
dilated upwards, basally extended into a long foot, obliquely 
inserted on top of ovary; stigmata 2, terminal, completely con- 
fluent or tightly adpressed to one another; rostellum long, trian- 
gular, acuminate, laminar with revolute margins; clinandrium 
formed by a narrow, hyaline margin, free from filament of 
anther. Anther ovate-ligulate, with a recurved apex, and witha 
free filament; pollinia clavate with distinct caudicles and a small, 
round viscidium. Ovary pedicellate, cylindric, not twisted. 
Terrestrial plants, completely leafless during flowering time. 
Roots so far unknown. Stem erect, slender with several hyaline 
sheaths, terminated by a loosely few-flowered, allsided raceme. 
Flowers not resupinate, small, with spreading segments. 
TYPE: Pelexia acianthiformis Rchb.f. & Warm. 
One species native to Brazil. 
Index to species 
Nothostele acianthiformis (Rchb.f. & Warm.) Garay, comb. nov. 
Basionym: Pelexia acianthiformis Rchb.f. & Warm., Otia Bot. Hamb. 
2:53, 1881. 
Odontorrhynchus Correa in Darwiniana 10: 157, 1953. 
Etymology: Odontos = tooth and rhynchos = snout, in ref- 
erence to the dentate rostellum (which is not 
snout-like) in the type specimen. 
Sepals rather dissimilar, free, subparallel with more or less 
spreading apices; dorsal sepal concave to cucullate, free from 
column; lateral sepals adnate laterally to column-foot and with 
it form an obliquely descending, somewhat enlarged, rounded 
base, not representing a true mentum. Petals linear, agglutinate 
along inner margins with dorsal sepal. Lip sessile to subun- 
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