to a very short stipe. 
This species has much the habit of Camaridium den- 
drobioides Schitr., but has very dissimilar floral segments. 
It is apparently allied to Mawillaria linearifolia A. & S., 
but differs in having short blunt leaves and much smaller 
flowers. 
Costa Rica, ““Bois. Collines de San Pedro de San Ramon. Alt. 
1100 m. 20-1x-1925.’’ A. M. Brenes (239) 1427. (Type in Herb. 
Ames No. 43846); ‘‘8-vimt-1925. Fleurs... en couleur jaune ver- 
datre pale... le calle de labelle... pourpre violacé foncé. Cultivé 
chez moi.’’ A.M. Brenes (182) 1878. 
Ornithidium sigmoideum C. Schweinfurth sp. nov. 
Herba robusta, sparsissime ramosa. Caules vaginis 
conduplicatis imbricantibus lanceolatis omnino celati, 
pseudobulbos perdistantes ferentes. Pseudobulbi com- 
planato-ellipsoidei, monophylli.. Folia oblongo-elliptica, 
cum petiolo distincto. Flores mediocres. Sepalum dor- 
sale oblongo-lanceolatum, concavum. Sepala lateralia 
oblongo-lanceolata. Petala oblonga. Labellum interne 
profunde saccatum, valde sigmoideum, superne triloba- 
tum cum lobis lateralibus semicuneatis erectis et lobo 
terminali parvo ovato conduplicato. Columna gracilis. 
Plant robust, about 45 cm. tall. Roots fibrous, flex- 
uous, numerous. Stem stout, very sparingly branched, 
about 5 mm. in diameter in the dried specimen, entirely 
invested by distichous imbricating shining sheaths which 
are conduplicate, triangular-lanceolate, deeply carinate, 
mucronate and slightly incurved in natural position, but 
are evanescent on the lower portion of the stem, bearing 
pseudobulbs at intervals of 25 em. more or less. Pseudo- 
bulbs complanate-ellipsoid, 2.8 em. long or more, mono- 
phyllous, shining, surrounded and surpassed by a pair of 
distichous leaf-bearing sheaths. Leaves oblong-elliptic, 
petioled; blade up to 15 em. long and nearly 4 em. wide, 
acute or acuminate, chartaceous, with the mid-nerve 
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