San Martin: Zepelacio, near Moyobamba, at 1200-1600 meters 
altitude, epiphyte in forest, flowers greenish violet, G. Klug 3563. 
(Tyre in Herb. Ames No. 60897). 
Pleurothallis longiserpens C. Schweinfurth sp. 
nov. 
Herba scandens, saxicola, funiformis. Radices numero- 
sae. Rhizoma elongatum. Caules secundarii breves, gra- 
ciles, adpressi. Folia lineari-oblanceolata, adscendentia, 
apice acuta, infra longe angustata. Inflorescentiae unicae 
vel plures, sub caulis apice, fasciculatae, uni- vel biflorae. 
Sepalum dorsale valde cucullatum, a basi oblongo-ellip- 
tica abrupte longe caudatum. Sepala lateralia lineari- 
lanceolata, sensim caudato-acuminata, usque prope basim 
libera. Petala multo breviora, spathulato-obovata, apice 
late rotundata, uninervia. Labellum panduratum vel tri- 
lobatum; pars inferior expansa oblato-suborbicularis, pars 
superior ovato-suborbicularis, fimbriato-lacerata, valde 
mucronata, superficie papillis dense ornata. Columna 
parva, crassa, cum pede in cornu validum incurvum ter- 
minante. 
Plant long-creeping, medium-sized, funiform. Rhi- 
zome slender, concealed by a thick bundle of fleshy roots. 
Secondary stems short, slender, appressed to the rhi- 
zome, up to 5cm. long, concealed by tubular evanescent 
sheaths, apparently 1-jointed above the middle. Leaves 
ascending, linear-oblanceolate, up to 8 cm. long and 8 
mm. wide, minutely tridenticulate at the acute apex, 
gradually narrowed to a sessile base, coriaceous, with 
margins revolute in the dried specimen. Inflorescences 
fascicled below the apex of the stem, one to several, ab- 
breviated, 1- or 2-flowered, in the axil of ascarious sheath 
which is about 1.5 em. long. Flower rather large, ringent. 
Dorsal sepal strongly concave, 17.2—21.2 mm. long and 
6—6.4 mm. wide, membranaceous, 8-nerved, with the 
lower portion oblong-elliptic and abruptly narrowed to a 
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