on each side by a broad fleshy flattened margin, about 4 
mm. long and 8 mm. wide. Column stout, abbreviated. 
This species is distinctive in its perplexing section of 
the genus Pleurothallis by reason of several floral char- 
acters. The dorsal sepal is much broader than the lamina 
of the fused lateral sepals and the deeply concave or 
bowl-shaped lip (which suggests the specific name) ap- 
pears to be extraordinary. 
Junin: Prov. of Tarma, Agua Dulce, at 2000 meters altitude, on 
a tree in low highland forest, March 17, 1948, F. Woytkowski 35487 
(Type in Herb. Univ. Calif.; Isoryers in Herb. Ames and in Herb. 
Mo. Bot. Gard. ). 
Pleurothallis cyathiflora C. Schweinfurth sp. nov. 
Herba epiphytica, crassa. Caules approximati, arcuati, 
uniarticulati, apice unifoliati. Folium unicum, breviter 
petiolatum; lamina oblongo-elliptica, apice basique ro- 
tundata; petiolus parvus, canaliculatus. Inflorescentia 
solitaria, folio subaequalis vel longior, flexuoso-suberecta, 
dense multiflora. Bracteae conspicuae, infundibuli- 
formes, patentes. Flores parvi, late cyathiformes. Sepa- 
lum dorsale suborbiculari-ovatum, valde concavum. Se- 
pala lateralia paulo longiora et angustiora, libera vel 
semiconnata, oblongo-ovata, infra concava. Petala el- 
liptico-oblonga vel late oblonga, apice truncato vel late 
rotundato. Labellum in positu naturali oblongum et 
tubulari-coneavum, expansum trilobatum et rhombico- 
obovatum, basi cuneatum, apice perlate rotundatum:; 
lobi laterales semiobovati; Jobus medius transverse el- 
liptico-oblongus; discus callis duobus brevibus supra et 
callo semilunari infra ornatus. Columna parva, in pedem 
latum carnosum producta. 
Plant rather stout, epiphytic. Stems approximate, 
arcuate, about 20 cm. or less long, 1-jointed above the 
middle, with a close tubular evanescent sheath at the 
joint. Leaf solitary, ascending, shortly petioled; lamina 
[ 90 ] 
