outer surface. Lateral sepals entirely free, narrowly tri- 
angular-lanceolate, slightly faleate, scarcely 8 mm.long, 
about 0.9 mm. wide, acute, 1-nerved with a prominent 
keel on the outer surface. Petals very small and dia- 
phanous, about 1 mm. long and 0.25 mm. wide, about 
equaling the column, narrowly elliptic-ligulate, acute or 
subacute, oblique at the apex, 1-nerved through the lower 
half. Lip simple, oblong, membranaceous, subsessile, 
about 1.4 mm. long and 0.6 mm. wide, very slightly 
broader near the base, broadly rounded at base and apex, 
with three approximate nerves, slightly undulate on the 
margins. Column inconspicuous, about 1 mm. long, 
winged on each side throughout. 
Pleurothalls membraniflora is vegetatively very sim- 
ilar to P. Broadwayt Ames, but is distinct in having 
minute petals and an entirely simple oblong lip without 
any thickenings. 
Costa Rica, San Pedro de San Ramon. **29-VI1-1935.°’ 4.M. 
Brenes (Herb. Brenes 20.571) (Tyre in Herb. Ames No, 44322.) 
Epidendrum pinniferum C. Schweinfurth sp. nov. 
Herba robusta. Caules alti, caespitosi, vaginis tubula- 
ribus arctis omnino obtecti. Folia numerosa, disticha, 
elliptica velelliptico-lanceolata. Inflorescentia terminalis, 
perbrevis, subsessilis, basi bifurcata; rami pauciflori, de- 
curvati. Flores subcarnosi. Sepala petalaque late patentia. 
Sepala oblongo-elliptica. Petala cuneato-spathulata. La- 
bellum columnae valde adnatum, trilobatum ; lobi later- 
ales subquadrato-dolabriformes, patentes; lobus medius 
sessilis, late flabellatus, apice truncatus, retusus, minute 
apiculatus. Columna apice truneato denticulata. 
Plant tall, doubtless epiphytic. Roots fibrous, stout. 
Stems caespitose, about 78 cm.tall, terete, entirely con- 
cealed by close tubular sheaths which are leaf-bearing ex- 
cept in the lower portion, the sheathed stems up to 6 mm. 
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