OF THE FOSSIL PLANTS OF THE COAL-MEASURES. 
213 
j Plate. 
Fig. 
Pages on v/hich 
references are 
made to the 
figures. 
7 
[ 
21 
i 
1 
A radial section through n branch showing; the outer- 
most trachelds of the vascular medullary cylinder at a, 
the inner cortical cells at e, and the prosencliymatous 
middle cortex at f; a foliar vascular bundle is passing 
outwai'ds at a'. Cabinet number, 419c. X 46 . 
j 
199 
7 
1 
22 
1 Radial section through the vascular axis, a, a : a, a 
foliar bundle passing outwards through the inner 
cortical cells, e ; a", centre of the vascular medullary 
cylinder consisting either of non-lignified trachelds 
or of procambial cells ; a"', trachelds very imper¬ 
fectly lignified ; a, trachelds, the llguification of 
which is complete. Cabinet number, 419c. X 85 . 
Lepidodendron parvulum, Wir.L. 
i 
1 
1 
1 
199 ' 
1 
: 8 
' 
23 
Transverse section of a branch : a, area occupied by a 
medulla ; h, vascular medullary cylinder; c, inner 
cortical zone ; d, outer cortex ; c, areas occupied by 
a special form of parenchyma ; f, leaves. Cabinet 
number, 421. X 35 . 
200 
! 8 
1 
24 
Section of a second branch showing the more sym- 
metiical arrangement of the special cellular areas, c, 
separated by the cortical bands, e. Cabinet number, 
420. X 35. 
1 
200 
8 
25 
A section of a dichotomising branch : h, horseshoe¬ 
shaped divisions of the medullary vascular cylinder ; 
c, special areas, occupied in this section by the 
special cells represented in fig. 27 \ f, leaves. Cabinet 
number, 424. X 35 . 
200 
8 
26 
Ordinary condition of the cortical parenchyma of figs. 
23-25 . 
200 
5 
1 i 
1 
I 
26 a 
Cells from the medulla of a branch of Lepidodendron 
Ilarcourtii, in which all the medullary cells are in a 
state of active meristemic multiplication. Cabinet 
number, 381 .. 
205 
