base incurved sides and flat slightly recurved apex, about 
3.7 mm. long, 2.4-8.4 mm. wide (when forcibly expand- 
ed), broadly rounded at the apex, cuneate at the base 
with the lateral margins forming intramarginal semiobo- 
vate lobules which end above the middle of the lip. Col- 
umn minute, stout, about 1.7 mm. long at the back, 
provided with an abbreviated semiorbicular fleshy foot. 
Pleurothallis Vargasu appears to be related to P. Cas- 
sidis Lindl. and to P.ewpansa Lindl., but has a dissimi- 
lar lip from that of both species. 
Apurimac: Prov. Abancay, ‘bosques altos de Ampay,’’ at 3700 
meters altitude, epiphyte (also on the ground), roots branching, June 
1938, C. Vargas 1075. (Tyre in Herb. Gray No. 7439); Vargas 2049. 
Octomeria boliviensis Fo/fe var. grandifolia C. 
Schweinfurth var. nov. 
Herba valde variabilis, caulibus saepissime longioribus 
et foliis saepissime majoribus et labello basi leviter auric- 
ulato a specie differt. 
Plant very variable. Stems ranging from 7.5 to 42.3 
em. long. Leaf elliptic-linear to narrowly elliptic-lance- 
olate, varying (when mature) from 11.7 to 27.7 cm. long 
including the short petiole and from 1.6 to 8.7 cm. wide. 
Flowers cream-color, yellow and dark red. Dorsal sepal 
elliptic-lanceolate, acute, about 1.2 cm. long and 4.5 mm. 
wide. Lateral sepals similar, slightly oblique. Petals 
obliquely elliptic-lanceolate, somewhat shorter than the 
sepals. Lip about 6.5 mm. long, sharply 3-lobed in the 
middle; lower portion pandurate with a more or less 
auriculate base; lateral lobes erect in natural position, 
small, obliquely semiovate, porrect, rounded at the apex ; 
mid-lobe rhombic-ovate, broadly truncate in front with 
a more or less sharply 8-lobulate apex, erose-denticulate 
on the margins except near the base; dise with a pair of 
keels similar to those of the type. 
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