into a subrotund concave lamina which is about 4.5 mm. 
long and 5 mm. wide, 4-nerved, minutely bidenticulate 
at the broadly rounded apex. Petals oblanceolate-spatu- 
late, 8 mm. long, about 1.9 mm. wide near the rounded 
apex, l-nerved with the nerve depressed on the upper 
surface and carinate beneath. Lip narrowly triangular in 
natural position with the center deeply concave and the 
fleshy sides erect, triangular-auriculate on each side at 
the base, about 2.1 mm. long and 2 mm. wide across the 
retrorse auricles, obtuse, about 1.1 mm. deep across the 
abruptly inflated middle. Column very short and stout. 
Pleurothallis saccatilabia differs from P. excavata 
Schltr. in having much smaller sepals and lip, and larger 
petals which are not oblong. From P. concaviflora C. 
Schweinf., it differs in having spatulate (not linear) petals 
and a less concave lip. 
Mexico: Mt. Ovando, Chiapas, at 1250-2370 meters altitude, 
flower violet, July 1938, E.Matuda 2546 (Tyre in Herb. Univ. Mich. 
Dupiicatre Type in Herb. Ames No. 55742). 
Isochilus linearis (Jacg.) R.Brown in Aiton 
Hort. Kew. ed. 2, 5 (1818) 209—Cogniaux in Martius 
Fl. Bras. 3, pt. 5 (1898) 3, t. 1. 
Epidendrum lineare Jacquin Select. Stirp. Amer. 
(1763) 221, t. 181, fig. 1. 
Cymbidium lineare Willdenow Sp. Pl. 4 (1805) 97. 
Leptothrium lineare Kunth ex Steudel Nomencl. ed. 
2 (1840) 82. 
Tsochilus leucanthus Rodriguez Gen. & Sp. Orch. Nov. 
1 (1877) 47. 
Isochilus linearis R. Brown var. 8. lewcanthus Cogniaux 
in Mart. FI. Bras. 8, pt. 5 (1898) 4. 
Tsochilus Langlassei Schlechter in Fedde Repert. 16 
(1920) 442. 
From a careful study of a drawing of the type of 
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