Pleurothallis crucilabia Ames & Correll sp. nov. 
Herba parva, epiphytica, erecta vel adscendens, caespi- 
tosa. Caulis gracilis, unifoliatus, vaginis lepanthiformibus 
omnino obtectus. Vaginae caulinae tubulares, costibus 
parce hispidis donatae, supra in apicem acuminato- 
apiculatum hispidum leviter dilatatae. Folium lineari- 
oblongum, acutum, coriaceum, marginatum, glabrum. 
Pedunculi saepissime duo, graciles ; racemi laxe pauciflori. 
Florum bracteae infundibuliformes, acuto-apiculatae, 
scariosae. Flores glabri, valde arcuati, pedicellis gracilibus 
conspicue arcuatis. Sepalum dorsale elliptico-oblongum, 
acutum, valde cymbiforme, nervis dorso carinatis. Sepala 
lateralia usque ad medium connata, basi gibbosa, oblique 
triangulari-lanceolata, acuminata, decurvata, dorso carina- 
ta. Petala oblique oblonga, apice late rotundata, uniner- 
via. Labellum breviter unguiculatum, in positu naturali 
arcuatum, expansum trilobatum, trinervium; lobi later- 
ales late rotundati, marginibus apicalibus leviter incras- 
satis; lobus medius oblongo-quadratus, apice subtrunca- 
tus. Columna generis. 
Plant small, epiphytic, erect or ascending, caespitose, 
up to 7.5 em. tall. Secondary stem slender, monophy!l- 
lous, 2-3.5 cm. long, concealed by lepanthiform sheaths; 
sheaths tubular, acuminate-apiculate at the slightly di- 
lated apex, sparingly hispid along the costae and on the 
apical margin. Leaf linear-oblong, acute, coriaceous, 
marginate, glabrous, 1.5—2.5 cm. long, about 5 mm. wide. 
Peduncles usually two, slender, up to 4em. long includ- 
ing the loosely few-flowered raceme. Floral bracts infun- 
dibuliform, acute-apiculate, scarious, 1.5-2 mm. long. 
Flowers pale yellow, glabrous, strongly arcuate, with 
slender persistent conspicuously arcuate pedicels which 
are about 83mm. long. Dorsal sepal elliptic-oblong, acute, 
deeply cymbiform, 3-nerved, dorsally carinate along the 
nerves, 4.5—5.3 mm. long, 2.5—8 mm. wide below the mid- 
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