EXPLANATION OF THE ILLUSTRATION 
Prare LXATIT. Fig. 1. Transverse section of M. O/seniae, showing speci- 
. . » se ae 
men with portions of four “steles’* grouped around the central core 
of parenchyma. Note ares of internally developed phloem, ~ 1.5 
Fig. 2. Transverse section of MW. Olseniae, showing portions of tive 
‘ ae - 
“steles’* and the crushed central parenchymatous core. i 
Fig. 8. Radial longitudinal section of WM. Olseniae, showing the alter- 
nate multiseriate circular bordered pits on the radial wall of a tra- 
cheid, ~ 115 
Fig. +. Transverse section, showing innermost secondary xylem and 
part of the primary wood of a “‘stele.*’ he lumena of the tracheids 
of both primary and secondary xylem are filled with a black amor- 
phous substance, partially organic and partially mineral. ~ 25 
hig. 5. Same section as fig, 4, but more highly magnified. Note the 
aggregates of primary xylem tracheids interspersed with irregular 
a= 
areas of crushed parenchyma cells. SO 
