near the middle, about 0.75 mm. long and 1 mm. wide 
across the upcurved sides. Column characteristic of the 
genus, minute, apically 3-lobed with the mid-lobe much 
the largest. 
This species is allied to Stelis Halli Lindl., but lacks 
the fractiflex rachis of the raceme, the round-ovate sepals 
and the trilobulate petals of that concept. It is unusual 
in having very broad sepals which are sometimes 8-nerved 
and sometimes 4-nerved. 
Huancave ica: Prov. of Tayacaja, Ampurco woods, between Sal- 
cabamba and Surcubamba, epiphyte on mossy tree, at 2900 meters 
altitude, January 15, 1939, H.E.Stork and O.B. Horton 10425 (Tyre 
in Herb. Field Mus. No. 1051159). 
Stelis triseta Lindl. var. pardipes (Reichb.f.) C. 
Schweinfurth comb. nov. 
Stelis pardipes Reichenbach filius Beitr. Orch. Centr. - 
Am. (1866) 96. 
The species described as Stelis triseta from Bolivia, 
and lately detected in Peru, was noted as having prolif- 
erating stems; whereas the concept Stelis pardipes, de- 
scribed later from Costa Rica and also occurring in Peru, 
has almost uniformly simple stems. A photograph of the 
type collection of S. triseta, however, shows two plants, 
one proliferous and the other with simple stems. The 
Peruvian collections recently identified as this species 
have uniformly proliferous stems. On the other hand, 
three Costa Rican specimens of S. pardipes (Standley 
33180, 33235, 37761) show proliferating stems. 
Stelis triseta has acute or subacute leaves with an 
abruptly short-cuneate base. S§. pardipes, a variable plant 
represented in the Ames Herbarium by a large number 
of collections, commonly has obtuse leaves with a grad- 
ually cuneate base and either strict or lax racemes. It 
may, however, have acute leaves. 
The flowers of Stelis triseta appear to be an exact 
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