concave, acute, 3-nerved, about 8 mm. long and 1.2 mm. 
wide. Lateral sepals acute at the apex, connate almost 
to the middle to form an elliptic-ovate concave lamina 
which is about 8 mm. long and is 4-nerved. Petals ob- 
liquely elliptic-lanceolate, acute, 1-nerved, about 2.3 
mm. long and 1 mm. broad, with minutely irregular 
margins. Lip ovate-oblong, simple, lightly contracted on 
each side above the middle, about 1.8 mm. long and 1 
mm. wide near the base, broadly rounded and denticulate 
in front, subtruncate at the base with a pair of minute 
retrorse auricles, provided in the middle of the base with 
an inverted V-shaped keel, 3-nerved. Column about 1.4 
mm. long, slightly arcuate, broadly winged (especially 
above) with a3-lobed termination of which the lobes are 
denticulate, provided with a short concave foot. 
The form of the petals distinguishes this species from 
its allies P. fuegi Reichb.f., P. swhsinuata Lindl. and 
P. truncicola Reichb. f. 
Ayacucno: Aina, between Huanta and Rio Apurimac, epiphyte in 
open woods, at 750-1000 meters altitude, ““segments pinkish red, 
green at base and at margin,’’ May 7, 17, 1929, E.P. Killip & A.C. 
Smith 23159. (Typr in U.S. Nat. Herb. No. 1357922). 
Pleurothallis Talpinaria Reichenbach filius in Flora 
69 (1886) 554. 
Talpinaria bwvalvis Karsten FE]. Columb. 1 (1859) 158, 
t. 76, non Pleurothallis btvalvis Lindl. 
Pleurothallis trimeroglossa Schlechter in Fedde Re- 
pert. Beih. 9 (1921) 78; ex Mansfeld in Fedde Repert. 
Beih. 57 (1929) t. 115, nr. 452. 
It is evident from a comparison of specimens of the 
type number of Pleurothallis trimeroglossa with the plate 
and description of T'alpinaria bivalvis that we are dealing 
with one species. 
In P. trimeroglossa, the stems are provided with only 
two sheaths (not three as described), and these sheaths 
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