of Lepidostrobus Brownii , Schpr . 
353 
EXPLANATION OF FIGURES IN PLATES 
XVI AND XVII. 
Illustrating Professor Bower’s paper on Lepidostrobus Brownii. 
Fig. i. Transverse section of the axis of Brown’s cone. X4. 
Fig. 2. The same in median longitudinal section. X4. 
Fig. 3, A. Part of a transverse section, showing (p) the central parenchymatous 
pith ; xy, the wood ; c, the innermost band of cortex ; sh, the endodermis (?). 
X300. 
Fig. 3, B. Part of transverse section of the central stele of Psilotum. x 150. 
Fig. 4, A. A leaf-trace bundle of Lepidostrobus Brownii, embedded in the dense 
innermost band of the cortex (c). The cells marked x have divided parallel 
to the surface of the bundle, and elongated slightly. Compare Figs. 5, 6. The 
arrow in this and other figures points towards the centre of the axis, x 300. 
Fig. 4 ,B. Section of another leaf-trace bundle to show how variable the details 
of structure may be from that shown in Fig. 4 ( a ). X300. 
Fig. 4, C. Transverse section of a leaf-trace of Lycopodium Phlegmaria for 
comparison with those of Lepidostrobus Brownii. x 300. 
Fig. 5. Cells x adjoining a bundle (in L. Brownii) which is approaching the 
periphery of the innermost band of cortex : they have divided, and have elongated 
so as to form intercellular spaces ( 0 ). x 300. 
Fig. 6. Ditto : the intercellular spaces ( 0 ) are larger, and cells more elongated, 
so as to form trabeculae, x 200. 
Fig. 7. Transverse section of a leaf-trace bundle with more fully-formed 
trabeculae traversing the large space which almost surrounds the bundle. The 
position of this bundle was in the outer dense cortex, x 300. 
Fig. 8, A. A single bundle isolated in the large cavity of the middle cortex, but 
showing on its margin points ( x ) where the trabeculae have been broken away. 
Elongated trabeculae (tr) project towards it from the dense peripheral band of the 
cortex, x 300. 
Fig. 8, B. Another similar bundle, x 300. 
Fig. 9. Median longitudinal section of such a bundle, showing ( x ) points where 
trabeculae have broken away, x 300. 
Fig. 10. Radial section, including three vascular bundles, together with the 
tissue surrounding them, and the trabeculae, many of which have broken away, 
from near the apex of the cone. 
Fig. 11. A few trabeculae, more or less broken, from a longitudinal section 
drawn on a larger scale, x 150. 
Fig. 12. Transverse section of a leaf-trace bundle of Lepidodendron selaginoides 
(slide No. 38) in the middle cortex, surrounded by lacunae traversed by irregular 
trabeculae, x 1 50. 
