TROPICAL amp:rican orchids 
apicule, coriaceous, apparently fleshy when alive. Inflores¬ 
cence solitary, short but conspicuously surpassing the leaf, 
terminal and also often lateral, loose, the rachis fractillex. 
Peduncle below the raceme filiform, 5-13 mm. long, with 
one to four remote inconspicuous infundibuliform sheaths. 
Raceme 1-2.5 cm. long. Pedicels spreading, up to 6 mm. 
long. Flowers very small, membranaceous in the dried con¬ 
dition. Lateral sepals narrowly triangular-lanceolate, long- 
acuminate, about 3 mm. long, with a prominent dorsal 
fleshy keel, 1-nerved. Dorsal sepal longer and broader, 
ovate-lanceolate, 3.5 mm. long, long-acuminate, strongly 
cucullate, unicarinate on the back, 1-3-nerved. Petals very 
obliquely elliptic-oblong, about 1.55 mm. long, 1-nerved, ob¬ 
tuse. Labellum simple, lingulate-lanceolate, about 1.9 mm. 
long, broadly rounded at the apex, shallowly rounded-dilated 
below the middle with the swollen portion erect in natural 
position, 3-nerved, pubescent above on the upper surface. 
Column minute, about 1 mm. long. 
Pleurothallis nana is closely allied to P. guadalupensis 
Cogn., but its stems have many more joints, its petals are 
dissimilar, and its flowers are differently colored. It is also 
related to P. Williamsii Ames, but has much smaller leaves 
as well as different petals and lip. 
Costa Rica, Pejivalle, C. H. Lankester 865, May 16, 
1924. “Flowers snow white, 3 purple veins on obverse of 
leaves, these disappear at complete maturity.” (Type in 
Herb. Ames No. 28677.) 
Pleurothallis parvula A. & S. sp. nov. Herba pusilla, 
caespitosa, radicibus fibratis numerosis. Caulis pergracilis, 
inferne vaginis tubulatis obtectus. Folium oblongo-ellip- 
ticum, margine revoluto erosum. Inflorescentiae folium 
superantes, laxissime pauciflorae, internodiis angulatis. 
Flos pro planta grandis. Sepala lateralia lanceolata, pro- 
funde carinata. Sepalum dorsale lanceolato-oblongum. 
Petala multo minora, anguste lanceolata. Labellum longe 
unguiculatum, circuitu obovatum; discus late ovatus, mar¬ 
gine eroso, basi utrinque constrictus. Columna apice late 
alata. 
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