ORGANIZATION OF THE FOSSIL PLANTS OF THE COAL-MEASURES. 953 
which is inserted between two bundles (v.b.) of the main stem. The primary 
vascular bundles (v.b’.), and interfascicular tissue of the branch are shown, and 
the connections with the wood of the main stem. O.N. 132** (from same 
stem as the lust). x 30, 
PLATE 80. 
Figs. 21 and 22. Calamites, 
Fig. 21. Part of a tangential section, passing through the primary wood, and showing 
the base of a branch. Near the bottom of the figure the section has touched 
on the canals of two bundles, and shows their disorganized protoxylem («.). 
All the tracheze have tangential pits—-characteristic of the inner wood. In 
the direction of the arrow (/f), a foliar bundle is shown. In the same straight 
line, further to the right, is another group of cells, which represents a similar 
bundle at the point when it begins to curve outwards. The branch has 
a minute pith, surrounded by groups of primary xylem. The connection of 
the latter with the nodal wood of the stem can be clearly seen at the lower 
side of the branch Secondary wood has only been formed towards the upper 
side of the branch. The connection with the wood of the stem is entirely 
from below. From a slide (No. 53) prepared by Mr. Lomax, in the possession ° 
of D. H. Scorr. x 30. 
Fig. 22. A. Part of a transverse section of a very large stem, showing in median 
section, the base of an occluded branch. The pith of the main stem is below 
the figure. In the branch the pith tapers towards the base. The connection 
of the wood of branch and stem is shown. Midway between the inner and 
outer limits of the wood of the stem, at the level indicated by the arrows, the 
pith of the branch comes to a sudden end, and is replaced by secondary wood 
seen in transverse section. X 6. 
B. Portion of same enlarged, showing transition from pith of branch (p) 
to anomalous wood (#) in region indicated by the arrows in 4. x 70. 
C.N. 134*. 
Figs. 23-26. Calamostachys Binneyana. 
Fig. 238. From a transverse section of a strobilus, showing the central cylinder or 
stele of the axis. The section passed through a fertile node, bearing 7 
sporangiophores. ‘The stele is obtusely triquetrous, with the vascular bundles 
at its prominent corners. There appear to have been 7 bundles in all; the 
projecting points of the xylem (sp) mark the places where the bundles 
passing out to the sporangiophores were given off. One such bundle is partly 
preserved (spt). On the inner side of the bundles in the cylinder are 
6 F 2 
