Pleurothallis caudatisepala is allied to P. propinqua 
Ames, but differs in having elongate-caudate sepals and 
a relatively small lip. 
Cosra Rica, *‘Haies. Entre La Balsa et Cataratas de San Ramon. 
Alt. 800 m. 12-x-1925. Fleurs. . . jJaunes-pales brunatre orangés, 
brunatres en vieillissant, labelle pourpre.’” 4. M. Brenes (259) 1445 
(Typr in Herb. Ames No. 43773). 
Pleurothallis concaviflora C. Schweinfurth sp. 
nNOv. 
Herba parva, caespitosa. Radices numerosae, fibrosae. 
Caules filiformes. Folium ellipticum vel oblongo-ellipti- 
cum, sessile, apice obtuso tridenticulatum, valde coria- 
ceum. Pedunculi fasciculati, uniflori, cum flore usque ad 
folii medium tendentes. Flos bilabiatus, carnosus. Sepa- 
lum dorsale ovato-ellipticum. Sepala lateralia in laminam 
suborbicularem connata. Petala multo minora, lineari- 
oblonga, apice crasso incurvata. Labellum  profunde 
conduplicato-concavum, triangulari-ovatum, basi cum 
auriculis retrorsis et in medio callo hippocrepiformi or- 
natum. 
Plant small, caespitose, up to 9 em. tall, probably 
epiphytic. Roots fibrous, flexuous, numerous, glabrous. 
Stems filiform, scarcely stouter than the roots, about 38-7 
em. long, provided near the base with a close tubular 
evanescent sheath, slightly enlarged toward the junction 
with the leaf. Leaf elliptic or oblong-elliptic, sessile, a- 
bout 8-8.8 cm. long and 7-11 mm. wide, minutely triden- 
ticulate at the obtuse apex, marginate, thickly coriaceous 
in the dried specimen with the mid-nerve more or less 
suleate above and carinate beneath. Peduncles numerous, 
fuscicled, 1-flowered, short. Flowers small, rather fleshy. 
Sepals apparently closely pubescent on the inner surface. 
Dorsal sepal concave, ovate-elliptic when expanded, a- 
bout 4-4.7 mm. long and 2.4-3.2 mm. wide, acute, 3- 
[114 | 
