Diacrium bicornutum (Hook.) Bentham in Journ. 
Linn. Soc. 18 (1881) 3812. 
Diacrium amazonicum Schlechter in Beih. Bot. Cen- 
tralbl. 42, Abt. 2 (1925) 108; Pabst in Arqu. Bot. 
Est. Sado Paulo 3 (1955) 125, t. 316. 
CoMMON NAME: Virgin Mary; Virgin Orchid (Trin- 
idad and Tobago). 
Pseudobulbs long-cylindric, terete, 10-80 cm. long, 
2-6 em. in diameter. Leaves 3-4, thick, oblong, usually 
quite obtuse to rounded, 6-20 (mostly 15-17) cm. long, 
20-50 mm. wide. Flowers few to 20, 5.5-6 ecm. wide; 
pedicel (with ovary) 8-5 cm. long. Sepals broadly ovate- 
lanceolate, bluntly short-acuminate, 25-82 mm. long, 
15-18 mm. wide. Petals ovate, usually clawed, acutish, 
22-28 mm. long, 20-23 mm. wide, upper margin usually 
with a conspicuous notch. Lip fleshy, as long as petals 
but narrower, deeply 3-lobate, basally with triangular 
tooth on each side; lateral lobes elliptic-ovate, rounded; 
mid-lobe oblong, obtuse-acuminate; disk above with 2 
erect, triangular, plate-like, obtuse, hollow projections 
near middle. Column 14-15 mm. long. 
The type of Caularthron bicornutum was collected in 
Trinidad by Bradford, who wrote on the label: ‘*This 
most beautiful species is found in the greatest abundance 
on the coast and on the adjacent islands at the Boca de 
Moros, Trinidad.—The rocks and trunks of decaying 
trees are in some places covered with it. This specimen 
was gathered on Gaspare Island March 12, 1846 on my 
return from an expedition to the coast of Venezuela. It 
flowers especially in the early part of the year from Jan- 
uary to April.” 
The culture of Caularthron bicornutum requires a 
rather warm greenhouse with high humidity (Warner, 
R. & B.S. Williams: Orch. Alb. 4 (1885) t. 157; Rolfe, 
| 87 | 
