NEW OR NOTEWORTHY ORCHIDS 
into fibers in anlhesis. Leaf spatulate to oblanceolate, very 
gradually narrowed to a slender indistinctly petioled base, 
very variable in size, 2.8-8.5 cm. long, up to 2.1 cm. wide 
above the middle, obtuse or subacute, minutely tridentic- 
ulate at the apex, mid-nerve more or less sulcate above and 
carinate beneath, chartaceous or coriaceous. Scapes very 
short, up to 2.5 cm. long including the approximate pedicels 
at the summit, commonly 1-2 to a stem, much shorter than 
the leaf, filiform. Flowers 1-6 in a congested cluster, each 
pedicel surrounded by an infundibuliform scarious bractlet. 
Lateral sepals falcate-lanceolate, shortly connate near the 
base, about 9 mm. long, 2.7 mm. wide near the point of 
union, sharply acute, 3-nerved, mid-nerve carinate on the 
outer surface. Dorsal sepal lanceolate-oblong, about 10 
mm. long, 4 mm. wide, subacute, 3-nerved, all the nerves 
carinate dorsally, concave near the base. Petals very ob¬ 
liquely pandurate, 4.5-4.9 mm. long, acute, the upper part 
of the anterior margin dilated, 3-nerved. Labellum in nat¬ 
ural position gently recurved with the sides incurved; lam¬ 
ina when expanded oblong, gently dilated in the middle, 
4.2-4.8 mm. long, about 2 mm. wide in the center, broadly 
rounded at the apex, biauriculate at base with small spread¬ 
ing auricles, anterior margins—increasingly toward the apex— 
shortly ciliate. Disc 3-nerved, fleshy except at the very 
base, minutely papillose within except at the base, indis¬ 
tinctly bicarinate just beyond the middle near the margins. 
Column shorter than the petals, arcuate, winged above with 
wing 3-dentate at the apex and the lateral teeth sharp, ex¬ 
tended into a broad excavated foot which runs onto the 
united portion of the lateral sepals. 
Pleurothallis guanacastensis has two close allies, P. 
pgrsodes Reichb. f. and P. fulgens Reichb. f. It differs from 
P. pgrsodes in having scapes which are much shorter than 
the leaf and are often several-flowered, somewhat dissimilar 
petals and auricled lip. It is outwardly very like P. fulgens, 
but it has differently formed petals and lip. P. acrisepala 
A. & S. has sharper sepals and petals, 2-nerved petals and 
dissimilar lip. 
28 
