CENTRAL AMERICAN ORCHIDS 
sepals 5 mm. long, united up to the apex, forming a deep 
semiovate sac which is bicarinate on the outside with the 
carinae converging and united at the tip of the sac. Dorsal 
sepal 4.5 mm. long, 2.5 mm. wide, elliptic, obtuse, 3-nerved, 
forwardly inclined. Petals 2 mm. long, clavate-spatulate, 
obtuse, conspicuously thickened above the middle, 3-nerved. 
Labellum 2 mm. long, 1 mm. wide, oblong, rounded at the 
tip, apiculate, cordate at the base, the auricles retrorse and 
closely oppressed to the column. Disc bicallose, with a pro¬ 
tuberant rounded callus on each side near the base, one 
in front of each triangular auricle. (Seen from the side, the 
erect base of the labellum appears to have fused with the 
abruptly deflexed pendent apical part.) Column fleshy, 
1.75 mm. long. Pollinia two, slenderly pyriform. 
In habit similar to Pleurothallis Pittieri Schltr., but in 
floral structure entirely different from it. It would seem 
that this species after anthesis becomes much larger in its 
vegetative parts. The labellum is similar to that of P. 
geniculaia Lindl. 
Costa Rica, Cascajal, C. H. Lankester K340. When 
fully developed over one meter high. (Type in Herb. Kew.) 
Pleurothallis Sanchoii Ames sp. nov. Radices 
graciles. Caules secundarii elongati, folium multo ex- 
cedentes, erecti, monophylli. Folium ellipticum. Flores 
fasciculati. Pedunculus cum flore vix folium aequans, 
gracilis, uniflorus. Pedicellus cum ovario elongatus. Sepala 
lateralia usque ad apicem cohaerentia, laminam subor- 
bicularem quadrinerviam formantia. Sepalum dorsale 
multo angustius, obtusum, trinervium. Petala lineari-tri- 
angularia, apice incrassata, acuta, uninervia, leviter curvata. 
Labellum rotundato-cordatum, acutum, carnosum, ecal- 
losum. Columna carnosa, prope medium constricta. 
Roots slender, whitish, spreading. Secondary stems 
2.5-6 cm. long, shorter when immature, very slender, with 
about two closely appressed cylindrical sheaths, mon- 
ophyllous. Leaf up to about 3 cm. long, usually not ex¬ 
ceeding 2.6 cm. in length, about 11 mm. wide near the 
middle, elliptical, coriaceous, exceeding the slender peduncle 
26 
