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EXPLANATION OF FIGURES ON PLATES XXI AND XXII. 
Illustrating Mr. West’s paper on Marattiaceae. 
ABBREVIATIONS. 
c.s., commissural strand; c.s/, central stelar system; c.s.", commissural strand of the central 
stelar system; comp.s., compensating strand; /./., leaf-trace; prothallium; p.r.t., trace of the 
primary root ; r.t., root-trace; st ., stipule; v.g., ventral gap. 
PLATE XXI. 
Fig. 1 A. Danaea alata, Sm. Model of the stelar system of the rhizome of a moderately large 
specimen, viewed from below. In this model the transition from the simpler vascular structure of the 
young sporophyte to the more complicated vascular structure of the adult sporophyte is clearly shown. 
The leaf- and root-traces are consecutively numbered in order of priority. An unusual feature of this 
plant was the absence of adventitious roots from the basal region of the rhizome ; it was probably due 
to this abnormality that the older portion of the rhizome had so far successfully resisted decay ; there 
is normally one root to each leaf of the young sporophyte. (N.B. The natural proportion between 
the length and breadth is here exaggerated in the ratio 1 : 2.) 
F f % 
