OF THE FOSSIL PLANTS OF THE COAL-MEASURES. 
475 
PLATE 33. 
Salisburia adiantifolia. 
Fig. 28. Transverse section of a young twig of the first year, made immediately below 
a terminal bud. Enlarged 17 diameters, a. Medulla, with numerous 
sphseroraphides. b. Xylem. c. Cambium and new fibro-vascular elements. 
d. Inner cortical zone of primitive cortex with sphaeroraphides. e. Incipient 
cork periderm, f Breaks in the xylem-ring where pairs of foliar bundles, g , 
are given off. g . Pairs of similar bundles reaching the periphery of the 
bark. 
Fig. 29. Transverse section of the petiolar base of a leaf-scale from the terminal bud. 
Enlarged 24 diameters, g. Pair of fibro-vascular bundles. 
