Pleurothallis obliquipetala Acura & Schwein- 
Surth sp. nov. 
Herba minima, caespitosa, muscicola. Radices fibro- 
sae, numerosae. Caules minuti, filiformes, maxima pro 
parte vaginis scariosis celati. Folia oblanceolata, acuta vel 
obtusa, inferne sensim angustata. Inflorescentia perbrevis. 
Flores singuli vel bini. Sepala petalaqgue membranacea. 
Sepalum dorsale peranguste lanceolatum, longe acumin- 
atum, trinervium. Sepala lateralia ovato-lanceolata, a- 
brupte longe acuminata, parte inferiore connata. Petala 
oblique rhombico-lanceolata, acuminata. Labellum ling- 
ulatum, basi lobulato-dilatatum, apice late rotundatum ; 
discus medio bicarinatus, parte superiore papillosus. 
Plant minute, caespitose, together with mosses form- 
ing a dense mat. Roots numerous, fibrous, flexuous, gla- 
brous, as stout as the sheathed stems. Stems up to about 
5 mm. long, filiform, monophyllous, mostly concealed by 
three imbricating loose tubular scarious sheaths. Leaves 
oblanceolate to obovate, obtuse or acute, gradually nar- 
rowed into a slender petiole, up to 11 mm. long and 
3.4 mm. wide when expanded, commonly conduplicate 
and apparently very fleshy in the living state. Inflores- 
cence very short. Flower solitary or two, large for the 
plant, membranaceous; perianth segments apparently 
subparallel. Dorsal sepal very narrowly lanceolate, long- 
acuminate to an obtuse tip, about 5.1 mm. long and 1.6 
mim. wide near the coneave base, 8-nerved with the nerves 
carinate dorsally. Lateral sepals ovate-lanceolate, con- 
nate for the basal third, rather abruptly long-acuminate, 
about 5.2 mm. long, 8-nerved with the inner nerves short 
and indistinct and the two outer nerves prominent and 
earinate dorsally, each free portion about 2 mm. wide. 
Petals asymmetrically rhombic-lanceolate with the an- 
terior margin dilated, acuminate, about 2.6 mm. long 
and 1 mm. wide in the middle, 1-nerved, irregularly 
[3 ] 
