concava from the Lindley Herbarium at Kew, this con- 
cept does not appear to be specifically distinct from the 
sarher JZ. foveata similarly represented in the Ames 
Herbarium. In the two records the scapes with their 
flowers seem to be nearly identical. The lateral sepals of 
Mavillaria concava are described as dorsally carinate near 
the apex, and no mention is made of such a character in 
M. foveata; but the photograph of the latter plant, when 
examined closely, indicates the presence of such an api- 
cal keel on the lateral sepals. Another apparent discrep- 
ancy between these concepts lies in the callus on the lip 
which consists of five raised lines in the drawing of the 
lip on the sheet of M. foveata, whereas an apically tri- 
dentate callus is depicted on the sheet of M. coneava. 
This apparent difference is non-existent, however, for 
the lip of MZ. foveata is described as three or five times 
sulcate. Finally, the leaf of JZ. concava appears to be 
about twice as broad as that of IZ. foveata, but the pro- 
portions of the leaf in one collection of Xylobium often 
show similar discrepancies. 
It has already been clearly shown that Mavillaria 
stachyobiorum is referable to the above species. 
The concept Xylobium Filomenot, described only from 
several inflorescences accompanied by a colored sketch, 
differs from Marillaria foveata in having somewhat 
smaller flowers. In spite of minute disparities from Vy/o- 
bium foveatum in the structure of the lip, it is apparent 
that this concept is synonymous with Y. foveatum. 
In the original description of Maaillaria foveata there 
was no mention of the pseudobulb, which apparently was 
lacking in the Lindley specimen. However, in the de- 
scriptions of Mavidlaria concava and M. stachyobiorum, 
as well as in the numerous collections of this species from 
Central America (especially from Costa Rica and Pana- 
ma) and from Peru, there is present an ovoid or oblong- 
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