V-shaped to right-angled with the median axis or to 
somewhat retrorse. ‘The lobules, 3-8 mm. long (meas- 
ured trom the central axis of the mid-lobe to their apex ), 
are truncate or rounded to acuminate-acute at their apex 
which is sometimes somewhat lacerate (J. isthm: form) 
and are separated trom the lateral lobes by a mere slit or 
the separation may consist of a well-marked isthmus. The 
disc bears at the base two more or less lamellate calli and 
is centrally thickened with three more or less developed 
approximate parallel ridges of which the central one ex- 
tends upon the mid-lobe and in some instances reaches the 
apicule. Column entirely adnate to the lip, clavate-dilated 
from a slender tubular shank, often somewhat arcuate: 
clinandrium usually provided with a more or less devel- 
oped tooth on each side. 
[71] 
