ORCHIDACE^ 



callo A-formi instructum. Gynostemium in positu naturali valde 

 arcuatum. 



Plant stout. Rhizome .5-1 cm. thick, woody, concealed by 

 sheaths. Roots ±1 mm. thick, fibrous, flexuous, rigid, striate-sul- 

 cate, apparently unbranched. Pseudobulb monophyllous, small 

 and very inconspicuous, closely wrapped by the base of the pe- 

 tiole and indicated only by a slight dilation. Leaf ±30 cm. long, 

 5 cm. wide, elUptic-lanceolate oblong-lanceolate or narrowly ob- 

 lanceolate, acuminate above, gradually narrowed to a compli- 

 cate or conduplicate base, erect or erect-spreading, subcoriace- 

 ous, many-nerved with five nerves prominent beneath. Petiole 

 ±10 cm. long, conduplicate, merged into the leaf blade. Scape 

 approximate to the leaf base, 40-60 cm. long, surpassing the leaf, 

 rigidly suberect from a shortly decumbent base, terete, clothed 

 at the base with several lanceolate imbricating scarious sheaths 

 and apparently enclosed — together with the base of the petiole 

 — in one or more narrowly lanceolate sheaths, provided — up to 

 the rachis — with remote, lanceolate, appressed or ascending 

 bracts. Rachis 22-36 cm. long, slightly arcuate above. Bracts of 

 the inflorescence ±1.2 cm. long, narrowly lanceolate, clasping at 

 base, long acuminate to the apex. Pedicel 2-3 cm. long, filiform, 

 ascending, the ovary short and little thickened. Perianth in the 

 dried specimen pellucid. Lateral sepals about 1.25 cm. long, 

 2.5 mm. broad across the lower half, linear-lanceolate, gradually 

 narrowed to an obtuse cucullate apex. Dorsal sepal linear, about 

 1.25 cm. long, 2 mm. wide, similar. Petals about 1.3 cm. long, 

 1.5 mm. broad, linear, obtuse. Lip about 1.3 cm. long, 8-9 mm. 

 broad, dilated from a cuneate base into a suborbicular or rarely 

 broadly elliptic limb, abruptly mucronate, the forward margins 

 erose-crenulate, provided with a a- or a -shaped callus at the 

 base, the middle nerve thickened and carinate beneath. Column 



[88] 



