TROPICAL AMERICAN ORCHIDS 
common on moss covered trunks at locality.” (Type in 
Herb. Ames No. 28294.) 
Pleurothallis melicoides Schlir. in Fedde Repert. 
Beihefte 19 (1923) 24. 
The Pejivalle specimens of C. H. Lankester differ from 
the type description in the following particulars. The stems 
are more slender and are usually less than 2 cm. in height 
instead of 2-3 cm. tall. The peduncle usually exceeds the 
leaf rather than almost equaling it. The pedicels appear 
much longer than their subtending bracts rather than 
almost equally long. The sepals and petals are slightly 
larger and the lateral sepals form a bidentate rather than an 
entire lamina. The ovary also appears to be shorter. 
Pleurothallis melicoides belongs to an extremely variable 
group of Pleurothallis, and the differences mentioned above, 
while noticeable, are scarcely specific. 
Costa Rica, Pejivalle, C. H. Lankester 869, May 15, 
1924. 2300 feet altitude. Common. Sepals yellowish green. 
Petals and lip (?) dark purplish. (Herb. Ames No. 28697.) 
Pleurothallis nana A. & S. sp. nov. Herba nana, 
lepanthiformis, gracilis, caespitosa. Caules filiformes, mul- 
tiarticulati, vaginis margine ciliatis. Inflorescentiae ter- 
minales et laterales, laxe distichiflorae, fractiflexae. Flores 
membranacei. Sepala lateralia anguste lanceolata. Sepa- 
lum dorsale majus, cucullatum. Petala oblique elliptico- 
oblonga. Labellum lingulato-lanceolatum, apice rotun- 
datum. 
Plant very small, 5-7.5 cm. tall, caespitose. Roots very 
slender, glabrous, flexuous. Stems scarcely stouter than the 
roots, spreading or arcuate, often branching and rooting at 
the nodes, many-jointed, apparently tightly enclosed in long 
tubular sheaths which are many-sulcate and inconspicu¬ 
ously muricate on the angles. Sheaths with infundibuliform 
spreading apices, long-ciliate on the margin. Leaves one 
to three to each stem, usually distant, always one at the 
summit; blades very small, oval, shortly petioled, 5.5-10 
mm. long, 3-6 mm. wide, margined, obtuse with a deciduous 
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