with a short supplementary nerve. Lip tubular-involute 
in natural position, concave at base, quadrate when ex- 
panded, about 1.5 mm. long and wide, truncate in front 
with a short broad fleshy callus at each apical angle, 8- 
nerved. Column short, stout, large for the flower, about 
1.2 mm. long at the back, with a stout ovoid foot. 
Pleurothallis quadrata appears to be without close al- 
lies. The specific name is in allusion to the expanded lip. 
Junin: Schunke Hacienda, above San Ramon, at 1400-1700 me- 
ters altitude, epiphyte in dense forest, June 8-12, 1929, EF. P. Killip 
& A.C. Smith 24856. (Tyre in U.S. Nat. Herb. No. 1359136). 
Pleurothallis ringens C. Schweinfurth sp. nov. 
Herba epiphytica, caespitosa. Caules teretes, prope 
basim uniarticulati, vaginis basilaribus evanidis obtecti. 
Folium erectum, conspicue petiolatum ; lamina ovalis vel 
ovato-elliptica, apice rotundata vel obtusa; petiolus gra- 
cilis, supra sensim dilatatus. Inflorescentiae abbreviatae, 
uniflorae, in spathae conspicuae axilla. Flos ringens. 
Sepalum dorsale valde cucullatum, lanceolato-ovatum, 
acutum vel breviter acuminatum. Sepala lateralia in lam- 
inam oblongo-lanceolatam navicularem valde bidentatam 
connata. Petala lineari-lanceolata, prope basim subquad- 
ratam utrinque unidentata. [abellum profunde triloba- 
tum, in positu naturali sigmoideum; lobi laterales parvi, 
porrecti, arcuato-oblongi, obliquissime bidentati; lobus 
medius multo major, anguste triangulari-ovatus, apice 
incurvus. Columna brevis, ad basim sensim dilatata. 
Plant caespitose, medium-sized, up to 27 cm. tall from 
the base of the plant to the apex of the erect leaf. Roots 
fibrous, glabrous, white or whitish, numerous. Stems 
terete, monophyllous, up to 16.5 cm. tall, 1-jointed near 
the base, provided below the middle with two close tu- 
bular evanescent sheaths of which the lower shows mi- 
nutely scabrous nerves. Leaf erect, long-petioled ; lamina 
[ 186 | 
