CENTRAL AMERICAN ORCHIDS 
lateralia usque ad basim libera, ligulato-oblonga, obtusa, 
membranacea. Sepalum dorsale simile. Petala ligulato- 
oblonga, obtusa, trinervia, membranacea. Labellum ob- 
longum, obtusum, simplex, trinervium. Columna carnosa. 
Secondary stems about 20 cm. long, 5 mm. thick near 
the inflorescence, with several elongated tubular closely 
oppressed sheaths. Leaf 17 cm. or more long, 6.3 cm. wide, 
narrowly elliptic, conduplicate at the base. Flowers nu¬ 
merous, crowded. Peduncles much abbreviated. Pedicellate 
ovary about 6 mm. long. Lateral sepals 8 mm. long, 2 mm. 
wide, free, ligulate-oblong, obtuse, 3-nerved, each lateral 
nerve with a supplementary branch. Dorsal sepal 9 mm. 
long, 2 mm. wide, ligulate-oblong, obtuse, somewhat 
thickened. Petals about 8 mm. long, about 2 mm. wide, 
3-nerved, similar to the lateral sepals. Labellum 3 mm. 
long, 1 mm. wide, oblong, obtuse, 3-nerved, simple, truncate 
at the base, mobile on the foot of the column, fleshy, thick¬ 
ened on the basal margin. Column 2.5 mm. long, produced 
into a conspicuous foot. Clinandrium entire. 
Allied to Pleurothallis octomerioides Lindl., from which 
it differs in the shape of the leaf and structure of the labellum. 
Costa Rica, Agua Caliente, C. H. Lankester 358. 
Labellum with a submarginal purple line; flowers waxy in 
consistency. Anther purple. (Type in Herb. Kew.) 
Pleurothallis crescentilabia Ames sp. nov. Caules 
secundarii elongati, validi, monophylli. Folium ovatum, 
usque ad apicem angustatum, coriaceum, in sicco nervosum, 
basi subcordatum, in petiolum conduplicatum brevem con- 
tractum. Flores glomerati. Sepala lateralia usque ad 
apicem cohaerentia, laminam ovato-lanceolatam formantia, 
basi valde concava, extus nervis prominentibus. Sepalum 
dorsale lanceolatum, acuminatum, acutum, trinervium, 
nervis prominentibus, concavum. Petala valde incrassata 
semiteretia, linearia, usque ad apicem angustata, sepala 
aequantia. Labellum crescentiforme, basi arrectum statim 
deflexum, auriculis post columnam attingentibus. Columna 
brevis, simplex vix in pedem producta. 
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