above, about 6.9 mm. long and 4.8 mm. wide, 9-nerved 
at the base. Petals cuneate-obovate, rounded or subacute 
at the apex, about 6.9 mm. long and 3.8 mm. wide above, 
1-nerved or indistinctly 3-nerved. Lip adnate to the col- 
umn nearly to its apex; lamina simple, suborbicular-obo- 
vate, minutely retuse and apiculate at the broadly round- 
ed apex, about 5.4 mm. in greatest length and 5.9 mim, 
wide above, the disc being mostly occupied by a large 
acute subquadrate-ovate 5-lobed concave callus. Column 
stout, abbreviated, about 2 mm. long. Ovary with a small 
subglobose vesicle at its summit at the junction with the 
lateral sepals. 
Another collection, G. Alug 984, consists of three 
small plants which are very dissimilar in appearance but 
the solitary flower examined is nearly identical with that 
of typical 27. magnicallosum. Its characters are as follows. 
Plant up to 9.8 em. high. Stem up to 2 em. high, sim- 
larly dilated upward and invested by close sheaths. Leaf 
solitary, apical, linear-lanceolate, up to 7.9 em. long and 
6 mm. wide, acuminate. Inflorescence abbreviated, few- 
flowered, incomplete in my specimen. Flower white and 
lilac. Dorsal sepal ovate-oval, subacute, about 8.5 mim. 
long and 5 mm. wide. Lateral sepals similar, strongly 
connate almost to the middle, about 7.5 mm. long and 
4.5 mm. wide. Petals cuneate-spatulate, abruptly acute, 
about 7.5 mm. long and 3.9 mm. wide above. Lamina 
of lip suborbicular-obovate, about 5.8 mm. long and 5.6 
mim. wide, minutely apiculate at the broadly rounded 
apex, with a similar large 5-lobulate callus. Column 
about 2 mm. long. Vesicle on ovary more prominent 
than in the type. 
There appear to be no close allies to this species. Zpi- 
dendrum Alou Schitr., while very dissimilar vegetative- 
ly, has a somewhat similar lip. 
Lorero: Vicinity of Iquitos, at 100 meters altitude, epiphyte, flow- 
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