inconspicuous; lateral calli on the orifice of 
the sac of the lip 
2. Robinsonit 
i. Lateral lobes of the lip smaller than the ter- 
minal lobe; mid-lobe retuse 
7. extmium 
c. Leaf-bearing stems 5 cm. long or usually much longer 
k. Bracts of the inflorescence subulate 
/, Peduncle much exceeding the leaves 
in length, at least twice as long 
10, agusanense 
/. Peduncle subequal to the leaves in 
length or usually much shorter 
m. Mid-lobe of the lip subequal to or 
longer than the lateral lobes; 
sheathed stems not conspicuously 
flattened; sepals not auriculate 
n. Central longitudinal callus pubes- 
cent for its entire length; mid- 
lobe of the lip subequal in length 
to the lateral lobes 
12. Hystrix 
n. Central callus not longitudinal, 
short, glabrous; mid-lobe of the 
lip longer than the lateral lobes 
11. Amesianum 
m. Mid-lobe of the lip considerably 
shorter than the lateral lobes; 
sheathed stem conspicuously flat- 
tened; sepals auriculate 
15, Webert 
k. Bracts of the inflorescence not subulate 
o. Lip distinctly 3-lobed; callus 
one 
p. Mid-lobe of the lip flat, 
broadly lanceolate; median 
callus not emarginate 
13. Wenzelit 
p. Mid-lobe of the lip canalicu- 
late, oblong; median callus 
strongly emarginate 
[79 ] 
