(U!); Lanjouw & Lindemann 136 (U!). — dist. marowijne; 

 seashore. Tenuissen 1072 (U!). — dist. brokopondo; Sara 

 Creek, van Donselaar 2132 (U!), 3249 (U!). Surinam River, van 

 Donselaar 2877 (U!); Schulz 7240 (U!). Raleigh Falls; upper 

 Coppename River. Mannega 356 (U!). French Guiana. Cayenne. 

 Broadway 227 (AMES!, NY!); Richard s.n. (W!). British Gui- 

 ana, pomeroon dist.; Moruka River, de la Cruz 1154 (NY!, 

 US!). Essequibo River. Gleason 892 (NY!). 



Field check: 3 rows of lamellae united into transverse plates 

 at apex with a few free-standing plates in front of it. Columnar 

 lobes are transversely oblong, acute to obtuse. 



Observation: The following illustrations belong to this spe- 

 cies: Venezuelan Orchids Illustrated 3: 116, 1965; Orchids of 

 Venezuela, Field Guide, PI. 167, 1979; Foldats in Lasser, Fl. 

 Venez. 15(3): 403, 1970; Orquidea (Mex.) 8(2): 97, 1978. 



Dimerandra emarginata (Meyer) Hoehne in Bolet. Agric. S. 

 Paulo 34a: 618, 1933. 



Basionym: Oncidium emarginatum Meyer in Prim. Fl. 

 Essequ. 259, 1818. 



Type: British Guiana. Along the River Essequebo. Meyer 

 2631 (GOET!). 



Synonym: Epidendrum lamellatum Westc. ex Lindl. in Bot. 

 Reg. 29: misc. 46, 1843. 



Dimerandra lamellata (Westc. ex Lind.) Siegerist 

 ex Hamer in Icon. PL Trop. pt. 13: t. 1213, 1985. 



Type: Country of origin unknown, presumed to be Honduras. 

 Barker s.n. (K-LindL!) 



Epiphytic, caespitose plants up to 40 cm. tall; roots flexuous, branching, 

 glabrous; Stems cylindrical from a bulbous base, suberect to arcuate, moder- 

 ately fractiflex, loosely leafy, especially towards the apex; leaves alternate, 

 articulate with leaf sheaths, linear-oblong, obtuse, obliquely retuse at apex, up 

 to 1 1 cm. long, 1 cm. wide; inflorescences short, produced in succession, few- 

 flowered; bracts ovate-cucullate, acute, much shorter than the subtending 

 flowers, up to 5 mm. long; flowers conspicuous with spreading segments; 

 dorsal sepal ovate-lanceolate to narrowly elliptic, acute to acuminate, up to 18 

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

 to 18 mm. long, 6 mm. wide; petals from a cuneate base, obovate-oblanceolate 

 to subrhombic-elliptic, acute, up to 18 mm. long, 10 mm. wide; lip basally 

 adnate to column, from a cuneate base obovate-spathulate, apiculate in front; 

 disc with 3 free rows of imbricating lamellae without accessory tubercules, 

 central ridge half as long and entire, whole lip up to 20 mm. long, 15 mm. wide; 



209 



