CENTRAL AMERICAN ORCHIDS 
Pleurothallis pergrata Ames sp. nov. Herba epi- 
phytica. Radices graciles, fibratae. Caules secundarii 
valde elongati, monophylli, vaginis angulosis muricatis 
vestiti. Vaginae tubuliformes, apice dilatatae, marginatae. 
Folium coriaceum, ellipticum, apice bidentatum apiculo in¬ 
ter jecto, marginatum, breviter petiolatum vel basi con- 
duplicatum. Flores fasciculati, folium vix aequantes. Se- 
pala lateralia prope basim cohaerentia, lineari-lanceolata, in 
caudam perlongam producta, subtus leviter carinata. Se- 
palum dorsale valde concavum, lanceolatum, in caudam 
longissimam terminans, trinervium. Petala late spathulata, 
obtusa, uninervia, columnam superantia. Labellum sub- 
panduriforme, membranaceum, basi valde concavum, extus 
per medium leviter carinatum, obtusum, intus ecarinatum. 
Columna gracilis, rostello elongate permagno. 
Epiphytic herb. Roots finely fibrous, spreading. Sec¬ 
ondary stems 2.5-6 cm. long, slender, caespitose, mono- 
phyllous, concealed by elongated muricate angulate sheaths 
.5 mm. in diameter. Sheaths about five in number, 5 mm. 
long, closely appressed, the muriculate appendages whitish 
and spreading, apex of each sheath dilated, marginate, 
acute. Leaf 1.5-2 cm. long, up to 7 mm. wide, elliptical, 
obtuse, bidentate at the tip with a short apicule between 
the teeth, marginate, narrowed at the base into a condupli- 
cate petiole. Flowers fasciculate, arising from the axil of 
the leaf, the pedicels hardly equaling the petiole in length. 
Lateral sepals about 1.8 cm. long, for the most part free, 
hardly 2 mm. wide where they are joined, free portion linear- 
lanceolate and prolonged into a filiform tail, lightly carinate 
on the outer surface through the middle, membranaceous, 
hyaline, tinged with pink-purple when dry, the tails yellow¬ 
ish. Dorsal sepal 1.8 cm. long, about 2 mm. wide near the 
base, lanceolate, similar to the lateral sepals, 3-nerved. 
Petals 2.5 mm. long, about 1 mm. wide at the middle, 
broadly spatulate, obtuse, membranaceous, similar to the 
sepals in texture, 1-nerved, margin obscurely glandular. 
Labellum 4 mm. long, basal margin erect, apical margin 
deflexed, subpanduriform when spread out, obtuse, with a 
concave base, mid-nerve prominent on the outer surface. 
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