On leaf, under side, small, obconic galls which in development appear
to burst through the epidermis, for gall is surrounded by the ragged
collar-like remnant. The rounded proximal end strongly sunken in the
leaf blade which is prominently convex on the opposite side. Distal
end truncate with funnel-like depression leading to the rather large
apical pore. This latter connects the depressed chamber within with the
exterior. Distal broad end 1½ mm. wide. Gall projects from leaf surface
1-1½ mm. Smooth; light greenish-yellow in color. Walls very thick
distally, very thin proximally where it is connected to the leaf at
the central region. On the upper side of the leaf the low, hemispheric
convexity is reddened, particularly toward the periphery. At first it
was thought that this gall might be a juvenile form of _H. tubicola_,
but later observations have shown it to grow no further in length. It
is without doubt distinct and new.