OSMUNDACEAE 531 



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

 where modifications of reduction and of special development are seen. 



A = leaf of Osmunda Presliann, J. Sin. B young plant of Osinunda regalis, L. C- 



?ler 



FIG. 293. 



n. B = yo' 



leaf of mature plant of Osnninda regalis. (From Engler and Prantl, Nat. T^flanzenfam.) 



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



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



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



