cauda which is 6.38-10. 4 mm. long, dorsally carinate along 
the mid-nerve. Lateral sepals free nearly to the base, ob- 
liquely linear-lanceolate, gradually caudate-acuminate, 
17-21.1 mm. long and 2.5 mm. wide, 2-nerved, dorsally 
‘arinate along the inner nerve. Petals much shorter than 
the sepals, spatulate-obovate, 4.5-5 mm. long and 4mm. 
wide, broadly rounded above with irregular margins 
(sometimes retuse or acute in the middle), 1I-nerved, 
membranaceous. Lip pandurate or 8-lobed, 5.3-—6 mm. 
long, sessile; basal portion with the erect semiorbicular 
sides or lobes complicate in the middle in natural posi- 
tion, membranaceous, 2.6-8 mm. long and 4—4.5 mm. 
across the lip when expanded; anterior portion ovate- 
suborbicular, slightly narrower than the expanded basal 
part, prominently mucronate, irregularly fimbriate-lacer- 
ate, with the surface densely covered with papillae; disc 
complicate and fleshy-thickened below in the middle 
with the thickened portion extended into a pair of short 
ridges. Column short, fleshy, dilated at the apex both 
dorsally and ventrally, 2.2-2.8 mm. long at the back, 
with a short stout foot which terminates in a porrect 
incurved free horn. Ovary triquetrous with the angles 
fleshy-alate. 
Pleurothallis longiserpens recalls P. macrorhiza Lindl. 
in habit. It differs from P. soratana Reichb.f. in having 
caudate sepals, very small 1-nerved petals and somewhat 
dissimilar lip. 
Ayacucuo: Prov. Huanta, mountains northeast of Huanta, on rocks 
at 3100-3200 meters altitude, February 1-10, 1926, A. Weberbauer 
7510 (Type in Herb. Ames No. 60978; Dupticate tyre in Herb. 
Field Mus. No. 562417). 
Pleurothallis quadrata C. Schweinfurth sp. nov. 
Herba parvula, dense caespitosa. Caules congesti, 
breves, vaginis duabus tubulatis velati. Folium ovale, 
[ 184 ] 
