up to 8 cm. long, 6 mm. wide; inflorescences fasciculate, 3 to 5, short, up to 1 .5 

 cm. long, few flowered; bracts ovate-lanceolate, cymbiform, acuminate, up to 3 

 mm. long; flowers fleshy with spreading segments; dorsal sepal narrowly 

 elliptic-lanceolate, acuminate, 17 mm. long, 5 mm. wide; lateral sepals 

 obliquely ovate-lanceolate, subfalcate, acuminate, up to 17 mm. long, 5 mm. 

 wide; petals from a somewhat cuneate base broadly elliptic, acute, up to 18 

 mm. long, 10 mm. wide; lip from a cuneate base subquadrate-spathulate, 

 truncate, occasionally lobulate; callus multilamellate in 3 rows, with an addi- 

 tional forked ridge on each side, up to 18 mm. long, 12 mm. wide; column 7 



mm. high with ovate-lanceolate, acuminate lobes to the clinandrium; pedicel- 

 late ovary up to 4 cm. long. 



Distribution: Peru. See above. — Brazil, amazonas; Boca 

 do Acre, Rios Purus & Acre. Prance et al 2581 (US!). 



Field check: Flowers fleshy; lateral sepals falcate; petals 

 broadly elliptic; lateral ridges forked. 



Dimerandra elegans (Focke) Siegerist, comb. nov. 



Basionym: Isochilus elegans Focke in Tidjdschr. Naturk. 

 Vetschr. 4: 68, 1851. 



Type: Surinam. Paramaribo. Focke s.n. (U!) Teste Reichen- 

 bach. 



Synonym: Dimerandra isthmi Schltr. in Fedde, Rep. Beih. 17: 

 44, 1922. 



Type: Panama. Canal Zone. Hills near Panama City. Powell 

 17 (AMES!) Holotype. (MO!) Isotype. 



Dimerandra major Schltr. in Fedde, Rep. Beih. 

 27: 136, 1924. 



Type. Colombia. Dept. Cundinamarca. Rio Pescado, Cordil- 

 lera Oriental. A. Schultze 29 (+B). 



Plants epiphytic, up to 40 cm. tall; roots fleshy, flexuous, glabrous; stems 

 approximate, erect, flexuous, leafy; leaves subcoriaceous, alternate, linear- 

 oblong to oblong-ligulate, obtusely bilobed at apex, articulate with leaf 

 sheaths, up to 1 1 cm. long, 1 cm. wide, commonly smaller; inflorescences short, 

 few-flowered; bracts ovate-cucullate, subacuminate, up to 3 mm. long; flowers 

 showy, with spreading segments; dorsal sepal narrowly ovate-lanceolate to 

 oblong-elliptic, acute to subacuminate, up to 19 mm. long, 6 mm. wide; lateral 

 sepals obliquely ovate-lanceolate, acuminate, up to 19 mm. long, 6 mm. wide; 

 petals from a cuneate base, obovate-oblanceolate to obliquely lanceolate- 

 elliptic, acute to subacuminate, up to 20 mm. long, 8 mm. wide; lip from a 

 cuneate base obovate-spathulate to suborbicular, subtruncate to retuse in front 

 or rarely more or less bilobed with a mucro; disc callose with 3 rows of lamellae 

 united into transverse plates at apex, and in front of it with a few free-standing, 



207 



