Pleurothallis magnipetala C. Schweinfurth sp. 
nov. 
Herba parvula, gracilis. Rhizoma probabiliter repens. 
Caules subapproximati, filiformes, apice unifoliati, vagi- 
nis duabus tubulatis arcte obtecti. Folium saepissime 
abrupte reflexum, anguste ovatum, profunde cordatum, 
supra angustatum, apice minute tridenticulato. Inflores- 
centiae axillares, abbreviatae, fasciculatae, uniflorae. 
Flores perparvi, bilabiati. Sepalum dorsale oblongo- 
ovatum, subacutum, concavum. Sepala lateralia in lam- 
inam late ovatam concavam connata. Petala pro sub- 
genere magna, oblongo-lanceolata vel lineari-elliptica, 
acuta, sepalis lateralibus subaequilonga. Labellum car- 
nosum, parvum, anguste ovato-triangulare. Columna 
brevissima, carnosa. 
Plant small, slender, subcaespitose, up to 11.5 cm. 
high. Roots numerous, fibrous, glabrous, simple, about 
as thick as the stems. Rhizome abbreviated, creeping. 
Stems subapproximate, filiform, 1-leaved at the apex, 
apparently 1-jointed below the middle, shortly decum- 
bent at the base and arcuate at or near the apex, about 
11 cm. or less long, with two close tubular sheaths (one 
at the base and the other longer one below the middle). 
Leaf narrowly ovate, deeply cordate at base, usually 
abruptly reflexed or widespreading, gradually narrowed 
above to an obtuse or subacute minutely tridenticulate 
tip, 4.3-5.1 cm. long from the apex of the lamina to the 
tip of a basal auricle, up to 1.8 cm. wide, chartaceous. 
Inflorescences axillary, abbreviated, consisting of numer- 
ous 1-flowered stems. Flowers very small, bilabiate, 
orange-yellow. Dorsal sepal oblong-ovate, subacute, 
concave, 8-nerved, about 4.8 mm. long and 2 mm. wide. 
Lateral sepals connate into a broadly ovate concave lam- 
ina which is minutely bidentate at the tip, about 3.5 mm. 
long and 2.5 mm. wide, prominently 2-nerved. Petals 
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