the lateral sepals but markedly smaller, obliquely oblong- 
lanceolate, acute, about 2.1 cm. long and 4.6 mm. wide 
near the base. Lip erect and parallel to the column in 
natural position, 1.3-1.4 cm. long, lightly sigmoid when 
viewed from the side, lightly but distinctly 3-lobed above 
the middle; lower portion deeply concave with erect 
sides, about 1 cm. long; terminal portion or mid-lobe 
much smaller, very fleshy, ovate to oblong, subacute 
when expanded, more or less sulcate above and carinate 
beneath, with revolute margins; disc in the middle with 
a short median oblong callus flanked by a pair of thick- 
ened lines, pubescent at the base. Column short and 
stout, lightly arcuate, somewhat clavate when viewed 
from the side, 6—6.5 mm. long at the back, with an erose- 
margined clinandrium which is 8-dentate at the apex, 
extended into a slightly longer foot. 
This species seems to be allied to the Ecuadorian Maa- 
llaria hastulata Lindl., but varies in having the petioles 
much shorter than the leaves and scapes, differently col- 
ored flowers and in an apparently dissimilar lip. It also 
has a very different lip from that of the Colombian ©. 
pulla Linden & Reichb. f. 
Cuzco: Habitat unrecorded, 1931, C. Bues s.n.; Prov. Quispicanchi, 
Chaupichaca, Marcapata Valley, at 1800-1900 meters altitude, ‘‘mixed 
formation of shrubwoods and grass steppe on stony places,’’? February 
19-20, 1929, A. Weberbauer 7884 (Tver in Herb. Field Mus. No. 
605347; isotype in Herb. Ames No. 61907); Hda. Itio, Marcapata, 
at 2000 meters altitude, in open rocky places, January 27, 1943, C. 
Vargas 3126; Prov. Convencién, Hda. Potrero, Sapan-Sachayoce, at 
2200 meters altitude, epiphyte in deep forest, March 5, 1942, Vargas 
2527. 
Maxillaria disticha (Lindl.) C. Schweinfurth comb. 
nov. 
Ornithidium distichum Lindley in Bentham P1. Hartw. 
(1845) 153. 
Since the description of Ornithidium distichum is too 
inadequate to afford a clear conception of the species, it 
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