so. Dorsal sepal lanceolate, 9-15 mm. long, 2-8.5 mm. 
wide, acuminate, more or less carinate at the apex. Petals 
linear-ligulate, linear-lanceolate or narrowly lanceolate, 
7.8-14.2 mm. long, 1-1.8 mm. wide, acute or more 
commonly acuminate. Lamina of the labellum narrowly 
triangular or more rarely ovate-triangular, 7—-12.5 mm. 
long, 4-8 mm. wide, acute or usually long acuminate. 
Dise with a callus which is tridentate or trilobulate at 
its apex. Column not distinctive, much as in the typical 
form of the species. 
Var. mvtum is separable from the typical form in 
having the apex of the callus tridentate or trilobulate and 
by the more acuminate apices of the floral segments, es- 
pecially of the labellum. In the extreme form the very 
long leaves of the main stems is also diagnostic. It differs 
from var. imbricatum in the acuminate apices of the peri- 
anth segments and in usually drooping inflorescences. A 
tendency toward the tridentate or trilobulate apex of the 
callus is sometimes existent in var. ¢mbricatum, especially 
so in the specimen from Cocos Island. 
EPIDENDRUM DIFFORME ALLIANCE 
The constituents of this alliance seem, as a whole, 
to be more consistent in vegetative characters than in 
those of the Mpidendrum ramosum and KE. paniculatum 
alliances, but the floral characters are variable, especially 
with regard to the labellum. The variations of the label- 
lum are sufficiently distinct to differentiate three varieties, 
but intergrade too much to warrant maintaining them as 
species. 
The typical form, as described from a Martinique 
specimen and as inadequately illustrated by Jacquin, is 
a comparatively small plant up to 80 cm. tall (16 em. in 
Jacquin’s illustration), caespitose with elliptic-oval leaves 
up to 6cem. long and nearly 8 em. wide. The inflorescence 
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