ovoid bifoliate or trifoliate pseudobulb which varies from 
3 to 9 cm. in length. 
This species appears to be very variable and wide- 
spread, being recorded from Mexico and Guatemala 
(type of Maaillaria concava) through Central America 
to Panama (type of M. stachyobiorum); from Jamaica; 
from the South American countries of British Guiana 
(type of M. foveata), Venezuela, Colombia and Peru 
(type of Yylobium Filomenoi). 
Xylobium pallidiflorum (Hook.) Nicholson Dict. 
Gard. 4 (1887) 225—Cogniaux in Urban Symb. Antill. 
6 (1910) 588. 
Mawillaria palhdiflora Hooker in Bot. Mag. 55 (1828) 
t. 2806. 
Maaillaria stenobulbon Wlotzsch in Ind. Sem. Hort. 
Berol. Append. Spec. Nov. (18538) 1. 
Xylobium latifolium Schlechter in Fedde Repert. 27 
(1929) 66. 
The concept, Mawillaria stenobulbon, has already been 
reduced to the synonymy of this species. 
A comparison between the typical West Indian Maz- 
laria pallidiflora (as exemplified by the plate) and the 
Bolivian Xylobium latifolium (as elucidated by the de- 
scription) shows that the latter concept apparently differs 
only in having slightly smaller flowers. 
Furthermore, a collection (Hodge 2973) from Domin- 
ica near St. Vincent, which is the type locality of Maa- 
tllaria pallidiflora, differs from X. latifolium only in hav- 
ing slightly longer scapes with white instead of yellow 
flowers which are somewhat larger than those of YX. 
latifolium. 
A Peruvian collection (Klug 3619) referable to X, 
pallidiforum has variable vegetative proportions with 
leaf-blades ranging from elliptic (as in X. latifolium) to 
[196 | 
