sider this concept as a variant of the widespread O. 
macranthum. It seems to differ from O.macranthum only 
in having one large median keel flanked by a smaller 
lamella on each side (instead of three equal lamellae) and 
in having narrower ligulate wings on the column. 
Oncidium obryzatum Reichenbach filius & Warsce- 
wicz in Bonpl. 2 (1854) 108; Regel in Gartenfl. 27 (1878) 
t. 925; Kriinzlinin Engler Pflanzenr. IV. 50, pt. 2 (Heft 
80) (1922) 239, fig. 20 B, a-d. 
The Peruvian collection cited below shows several dis- 
crepancies from typical examples of O. obryzatum in the 
Ames Herbarium. 
The pseudobulb is bifoliate, not unifoliate as described. 
The leaves are longer than exemplified, being up to 52.5 
em. long. The branches of the peduncle appear to be 
rather more distant than otherwise shown, being about 
5-6.5 cm. (instead of 2-4 cm.) apart. The sepals and 
petals, although closely similar to those of the typical 
form, are somewhat abruptly acute, rather than obtuse 
or rounded or even retuse. The narrow middle part of 
the lip is somewhat broader than usual and the anterior 
portion or middle lobe is narrower relative to the basal 
portion. The column wings are merely acute, not acu- 
minate, above. 
In view of the general agreement of this specimen 
with the typical form, however, this collection is incor- 
porated with O. obryzatum. 
Peru: Cajamarca, Cutervo, about Socota, on Socota River, at 2800 
meters altitude, epiphyte, December 11, 1938, H. E. Stork & O. B. 
Horton 101852. 
Oncidium pyramidale Lindley in Ann. & Mag. 
Nat. Hist. 15 (1845) 384; Fol. Orch. Oncidium (1855) 
29, no. 98; Veitch Man. Orch. Pl., pt. 8 (1892) Oncid- 
ium 73; Kranzlin in Engler Pflanzenr. IV. 50, pt. 2 
(Heft 80) (1922) 195, fig. 16 J, a-c. 
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