579 
sion, and fissures where the leaves are attached (fig. 2). Higher 
up the epiphlceal markings assume rather more of a quadrilateral 
Fig. 2. 
form, with the depressions less deep, and the fissures for the leaves 
giving off prolongations on either side. Farther up the markings 
are smaller in size, obliquely-quadrilateral, and present circular 
dots along the boundary lines chiefly (fig. 3). Higher still the 
Fig. 3. 
quadrilateral form becomes more apparent, and the dots disappear 
(fig. 4). The epiphloeum thus presents differences in its markings 
at different heights on the stem. 
The middle part of the bark, or mesopliloeum, is well developed, 
and is of a spongy consistence. When examined microscopically it 
is seen to be composed of cells of various shapes — some elongated 
VOL. iv. 4 i 
