conduplicate sheath; sheath acuminate, up to 1.5 cm. 
long. Floral bracts infundibuliform, acute-apiculate, scar- 
ious, 8-4.5 mm. long. Flowers rather large, yellow or 
greenish yellow, with short pedicels; pedicels about as 
long as the bracts. Sepals granulose on the inner and 
outer surfaces and along the margins. Dorsal sepal nar- 
rowly linear, long-acuminate, 3-nerved, sulcate below the 
middle, 16-17 mm. long, 1.5—2 mm. wide. Lateral sepals 
united almost to the apex to form an elliptic-lanceolate 
lamina; lamina sharply bifid, conspicuously gibbous at 
the base, 6-nerved, dorsally carinate along the mid-nerve 
of each sepal especially below the middle, 16-18 mm. 
long, 6.5-7.2 mm. wide at or near the middle. Petals 
linear-oblanceolate, acute to shortly acuminate, with the 
margins irregularly long-serrate above the middle, 1- 
nerved, 3.5—-4.5 mm. long, about 1 mm. wide. Lip strong- 
ly arcuate at the base, with a prominent claw; lamina 
triangular-lanceolate, shortly acuminate, with a promi- 
nent denticulate auricle on each side at the base, irregu- 
larly fimbriate along the margins, 6—6.3 mm. long, 2.5-38 
mm. wide at the base; disc 8-nerved, coarsely papillose ; 
claw fleshy-thickened, subquadrate, with a minute tooth 
on each side at the base, 1.5-2 mm. long, 1.2—1.5 mm. 
wide. Column rather stout, broad, irregularly crenate 
at the apex, 3-4 mm. long, with a foot 3-4 mm. long. 
Capsule obliquely ellipsoid, about 2 cm. long. 
Pleurothallis angustisepala is easily distinguished from 
P. Rowleei Ames, a close ally, by its narrowly linear 
dorsal sepal and by its differently shaped fimbriate and 
auriculate lip. 
GuaTEeMALA: Alta Verapaz, above Tamahi, on tree, alt. 900-1200 
m., April 5, 1939, P. C. Standley 70958 (Type in Herb. Field Mus. 
No. 995124); same data, P. C. Standley 70895 (Herb. Field Mus.); 
growing on the under side of limbs, on a small shrub at about two to 
three feet from the ground Nov. 28, 1920, H. Johnson 1169 (Herb. 
Ames). 
