NEW OR NOTEWORTHY ORCHIDS 
8 cm. long, tapering upward from a broad base which is 3 cm. 
thick in greatest diameter, yellowish and deeply sulcate 
when dry, subtended by rigid imbricating sheaths, 5-leaved 
at the summit, the leaves imbricating at the base, distichous. 
Leaves 22.5-27 cm. long, 4 cm. or more wide, thinly cori¬ 
aceous, oblong-lanceolate, acute, contracted at base into a 
conduplicatc petiole which is about 5 cm. long. Flower 
solitary on a short scape which arises from the young 
rhizome at the base of the terminal pseudobulb. Scape com¬ 
pletely concealed by imbricating sheaths, stout. Lateral 
sepals 5 cm. long, 1.6 cm. wide, oblong, abruptly rounded to 
the acute tip, sharply reflexed above the middle, connivent 
below the middle and with the dorsal sepal forming a tube. 
Dorsal sepal similar, but a little narrower. Petals 2.4 cm. 
long, about 8 mm. wide, broadly oblanceolate, apiculate, 
with a callus-thickening on the inside near the tip. Labellum 
1.4 cm. long, 5 mm. wide near the apex, 3-lobed, oblanceolate 
in outline when spread out; lateral lobes erect, the free 
portion of each lobe 1.5 mm. long, triangular-acute (from 
tip of the lateral lobes to the base of the labellum 9 mm. 
long); middle lobe 6 mm. long, oblong-orbicular, obtuse, 
upper surface minutely glandular, under surface heavily 
verrucose along the middle. Disc with a median bilobed 
callus, minutely glandular. Column 1 cm. long, fleshy. 
Trigonidium Lankesteri is readily distinguished among 
the Central American species of the genus by means of its 
exceptionally large flowers, elongated rhizome and 5-leaved 
pseudobulbs. 
Costa Rica, Las Cbncavas, in cultivation, C. H. Lan- 
kester 367 (Type) & 465, February 2, 1923. Sepals cinna¬ 
mon or clay color (Ridgway), on the frontal portion, exte¬ 
riorly, veined purplish, where forming tube olive ochre to 
light yellowish olive. Petals shining, veined chocolate 
spotted with purple, also a suffused patch of chocolate on 
inner upper angle of sepals. Labellum only just visible with¬ 
out spreading sepals and petals, ivory white, spotted beneath 
and above with deep chocolate. Flowers 4.2 cm. across from 
rip to tip of the lateral sepals, 3.9 cm. long from angle formed 
33 
