metric, 1-nerved. Petals narrowly linear, gradually di- 
lated at the oblique base, about 4.9 mm. long, obliquely 
acute, I-nerved. Lip about 5.2 mm. long including the 
claw; claw conspicuous, subquadrate, very fleshy with 
erect undulate sides; lamina narrowly triangular-hastate, 
with retrorse ovate-triangular obtuse auricles, gradually 
narrowed above and abruptly constricted near the apex 
to form a prominent recurved mucro; dise with a stout 
fleshy keel extending nearly from the base of the lamina 
to the subapical constriction, 5-nerved. Column short, 
stout, about 1.9 mm. long, strongly dilated at base and 
less so above, with a pair of semiorbicular porrect wings 
at the apex. 
Liparis cordiformis is vegetatively similar to L.neu- 
roglossa Reichb.f., but has a very different lip. Appar- 
ently the closest ally of this plant is L. fantastica A. &S., 
but the latter species has much larger flowers and a dis- 
similar lip. 
Mexico, State of Michoacan, stony lava-fields near Patzcuaro. In 
leaf-mould in shady places of mixed forest on rocky slopes. At 2150 
meters altitude. October 5, 1933. Erik M. Ostlund 3135 (Collector 
O. Nagel) (Type in Herb. Ames No. 41386). 
Masdevallia tenuissima C. Schweinfurth sp. nov. 
Herba nana. Radices fibrosae, glabrae. Caules per- 
breves, vaginis tubularibus obtecti. Folium singulum, 
lineari-ellipticum vel lineari-oblanceolatum, erectum. 
Scapus singulus, filiformis, folium plus minusve super- 
ans, saepissime uni- vel biflorus. Sepala connata, in caudas 
‘arnosas abrupte contracta. Sepalum dorsale ovato-subor- 
biculare, cucullatum. Sepala lateralia lanceolata. Petala 
minuta, lanceolata, apice oblique tridentata. Labellum 
petalis aequilongum, oblongo-lanceolatum, dimidio ba- 
sali bicarinatum. 
Plant dwarf, caespitose, up to 8 em. high. Roots fi- 
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