NEW OR NOTEWORTHY ORCHIDS 
Costa Rica, Province of Cartago, Dulce Nombre, Paul 
C. Standlei) 35805, February 27, 1924. On tree. 1400 meters 
altitude. 
Hexisea Lankesteri Ames sp. nov. Herba epiphytica, 
foliis subteretibus instructa. Caules graciles, paucivaginati, 
vaginis demum in fibras solutis. Sepala triangulari-ovata 
vel oblongo-lanceolata, acuta. Petala oblonga, nonnihil sub- 
pandurata. Labellum membranaceum, saccum ovario adna- 
tum formans, prope basim valde deflexum, superne in lami- 
nam subovatam expansum, apice valde retuso. Discus 
infra medium callosus. Columna gracilis. 
Roots fibrous, whitish, smooth, spreading. Stems 
slender at the point of origin, about 1.5 dm. long, gradually 
but slightly thickened upward, subdichotomously branched 
above, jointed, when young concealed by closely oppressed 
imbricating scarious sheaths, when mature barely concealed 
by the spreading fibrous remains of the withered sheaths. 
Leaves 6-11.5 cm. long, about 3 mm. in diameter near the 
base, semiterete, pointed, obliquely spreading, jointed. In¬ 
florescence arising from the axil of a terminal leaf. Flowers 
white, borne singly, inconspicuous, subtended by scarious 
imbricating sheaths. Pedicel with the ovary about 5 mm. 
long. Lateral sepals 6.5-7 mm. long, about 3 mm. wide, ob¬ 
long-triangular, acute, thickened at the tip, adherent to the 
lip at base and with it forming a conspicuous sac which is 3 
mm. long and adnate to the ovary. Dorsal sepal 6 mm. long, 
about equal to the laterals, oblong-lanceolate, conspicuously 
thickened and fleshy at the acute tip. Petals 5-6 mm. long, 
narrower than the sepals, oblong, lightly pandurate, variable 
in width, subacute, membranaceous, exceeding the column. 
Labellum adnate to the column at base, with a conspicuously 
bent claw; free portion about 5 mm. long, 4.5 mm. wide in 
front of the claw, broadly ovate, retuse, with an obscurely 
erose margin, fleshy-thickened on the disc,— the thickening 
extending forward on the disc, somewhat interrupted in front 
so that it appears to be made up of crescentiform calli, one 
on each side. Sac (formed by the labellum and lateral sepals) 
47 
