Central American orchids, Pleurothallis pantasmu 
Reichb.f. and P. circumplexa Lind]. In general appear- 
ance it more nearly resembles P. pantasmu, but differs 
in having much larger flowers with a pubescent ovary 
and truncate-tipped petals. It varies from P. circumpleaxa 
in having leaf-blades that are usually narrower, larger 
flowers and dissimilar broader petals. 
Cuzco: Prov. of Paucartambo, Yanamayo-Tambomayo, at 1800 
meters altitude, May 4, 1947, C. Vargas 6499 (Tyrer in Herb. Ames 
No. 65152). 
Pleurothallis retusiloba C. Schweinfurth sp. nov. 
Herba epiphytica, mediocris. Caules saepissime fas- 
ciculati, vaginis tubulatis duabus vel tribus ornati, apice 
unifoliati. Folium breviter petiolatum; lamina elliptico- 
oblonga, apice late obtusa et minute bilobulata, basi late 
cuneata. Inflorescentiae folia plusminusve superantes, 
dense multiflorae. Flores perparvi, membranacei. Sepala 
conspicue carinata, acuta. Sepalum dorsale valde conca- 
vum, oblongo-ovatum, acutum. Sepala lateralia fere 
usque ad medium connata, sepalo dorsali similia. Petala 
circiter duplo breviora, oblongo-cuneata, apice oblique 
subtruncata vel leviter retusa, trinervia. Labellum minus, 
trilobatum, cum lobis lateralibus semiobovatis et lobo 
medio subquadrato et leviter retuso. Columna minuta, 
in pedem carnosissimum extensa. 
Plant epiphytic, medium-sized. Rhizome apparently 
shortly creeping, woody. Roots fibrous, glabrous, slen- 
der, numerous. Stems in fascicles of two or three, envel- 
oped at the base by two or more stout tubular imbricating 
sheaths, or more rarely solitary and 2-8 cm. distant, 
straight to lightly flexuous or arcuate, about 9-14 cm. 
long, provided with two or three remote tubular sheaths 
of which the upper one equals or surpasses the apex of the 
stem. Leaf solitary, ascending, short-petioled; lamina 
elliptic-oblong, lightly retuse-bilobulate at the rounded 
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