Labellum lineari-lanceolatum, acutum, intus paulo pap- 
illosum, basi biauriculatum. Columna alata, apice lacer- 
ata, breviter pedata. 
Small, repent, or apparently caespitose, epiphytic 
herbs. Secondary stems short, mostly less than 5 mm. 
long. Leaves narrowly oblanceolate, obtuse, coriaceous, 
gradually tapered to the base, 25-45 mm. long, 4-7 mm. 
broad. Inflorescence 1- to 8-flowered (mostly one); the 
peduncle filiform, shorter than the subtending leaf; 
bracts ostiolate, mucronate, about 1.5 mm. long. Dorsal 
sepal about 8.5 mm. long and 1.1 mm. broad, lanceolate, 
acute, cucullate, 3-nerved, median nerve thickened and 
raised on the back. Lateral sepals about 3.5 mm. long 
and 0.8 mm. broad, free almost to the base, but the Joined 
portion somewhat gibbous, otherwise as the dorsal sepal. 
Petals about 8 mm. long and 0.75 mm. broad, lanceo- 
late, abruptly acuminate from the middle, entire or 
minutely serrulate, Il-nerved. Lip about 2.5 mm. long 
and 0.5 mm. broad, linear-lanceolate, acute, upper sur- 
face papilliferous (especially toward the base), slightly 
fleshy, obscurely suleate along the median line, 3-nerved ; 
base biauriculate, the auricles thin and membranaceous, 
about 0.1 mm. long. Column about 1.5 mm. long, 
winged and lacerated toward the apex; rostellum about 
0.2 mm. long, oblong, navicular, exactly closing the 
stigmatic opening; column-foot about 0.5 mm. long, 
extending into the gibbous bases of the lateral sepals. 
Mexico: in damp forests on trees, Pacific side, river valley, Copa- 
lita, northwest of Pluma Hidalgo, at 1000-1100 meters altitude, lon- 
gitude 96°28’ west, latitude 15°57’ north, sepals amber yellow, petals 
and lip blackish purple, September 1, 1937, Nagel & Juan G. [onzdles | 
6456 (Tyrer in Herb. Ames No. 51909). 
Pleurothallis oblanceolata is closely allied to P. minu- 
tals Lind]. It may be distinguished as follows: 
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