datum, obtusum; basis biauriculata. Columna generis, 
arcuata. 
Small, caespitose, epiphytic herbs. Secondary stems 
2-4 cm. long, slender, covered with one or two scarious 
sheaths which are soon deciduous. Leaves 5-8 cm. long, 
1.2-1.6 em. broad, oblanceolate, obtuse, coriaceous, 
about twice as long as the secondary stems. Inflores- 
cence few-flowered, shorter than the subtending leaf. 
Dorsal sepal 10-12 mm. long, 8-5 mm. broad, narrowly 
oblong, obtuse, 5-nerved, subgaleate, exceeding the lat- 
eral sepals, dorsally apiculate at the apex. Lateral sepals 
7-8 mm. long, the pair about 6 mm. broad, connate for 
a little more than half their length, ovate, strongly gib- 
bous at the base and strongly recurved, each sepal 3- 
nerved, acute, apiculate. Petals 4-4.5 mm. long and 
about 2.5 mm. broad, obovate or deltoid-obovate, ob- 
tuse, 3-nerved, somewhat oblique, unguiculate. Lip un- 
guiculate, claw about 1 mm. long, short-biauriculate at 
the base; lamina 2.5-83 mm. long and about 2—2.5 mm. 
broad, subcordate, obtuse, somewhat constricted toward 
the apex, with two crescent-shaped lamellate calli ex- 
tending from the base nearly to the apex and with two 
smaller, serrate-lamellate calli at the middle near the 
base. Column 4-5 mm. long, arcuate, anterior half 
winged with the wings serrulate ; pollinia two, ceraceous ; 
column-foot about 2 mm. long. 
Mexico: on trees in oak forest near Omiltemi, State of Guerrero, 
at 1840 meters altitude, longitude 99°41’ west, latitude 17°30/ north, 
April 22, 1935, Juan G. lonzdles| 3245 (Tyee in Herb. Ames No. 
51931). 
The type is a specimen collected at the locality indi- 
cated and flowered in a greenhouse in Mexico City. 
Pleurothallis aristocratica is allied to P. hieroglyphica 
Ames from which it may be distinguished by: 1) flowers 
about twice as large, 2) striated not mottled sepals, 3) 
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