OSMUNDACEAE 



531 



their length : ' in the upper regions this is more obvious than in the lower, 

 where modifications of reduction and of special development are seen. 



Fit,, 293. 



A =leaf of Osnntmla Preslinn/i, J. Sin. /' yumis plant of IhnmiiJa rega/is, L. C = 

 leaf of mature plant of Osnimu/n i-f^n/is. (I i.>m Englerand I'rantl, .\ : /. Pftanzenfmn.) 



In the Osmundaceae this results in the formation of the broad protective 

 leaf-base. In Osmnnda the wings are traceable as continuous down to the 



'See Phil. Trans., 1884, p. 573. 



