EXPLANATION OF PLATE IV. 



Fig. (I, brancU sliowiug the terminal spring slioot ol' the seasDU witli eharacterislie, large silvery white winter 

 bud ; the bundles of leaves arise from the axils of the leaf-bracts of the last two seasons, the lirst leaves of the second 

 year already shed; /;, detached bundle of mature leaves with sheath ; c, d, scales of the sheath, magnified three and 

 nine times; e, transverse section through base of leaf bundle showing imbrication of sheath scales, magnified 30 

 diameters; /, transverse section of an immature leaf, magnified 'M diameters; g, transverse section of a mature leaf, 

 magnified 45 diameters, showing the microscopic structure (as pointed out for /*. echinata, f, f); h, longitudinal se<r- 

 tion of the dorsal side of a mature leaf showing two rows of stomata and the serrated edge, magnified 15 diameters. 

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