Explanation of Plate IX. 



Adiantum macrophyllum Swz. p. 146. 

 Fig. 1. A divided basal pinna. X x- 



Fig. 2. A forked basal pinna from the same frond. X I. 

 Fig. 3. A simple pinna from the same frond. X 1. 



Adiantum flatyfhyllum Swz. p. 147. 

 Fig. 4. A fertile pinna, the second from the base. X 1. 

 Fig. 5. A basal pinna from a younger frond. X I. 



Adiantum villosum L. p. 148. 

 Figs. 6-8. Middle pinnules. X i- 

 Fig. 9. A basal pinnule. X i- 

 Fig 10. A terminal pinnule. X 1. 

 Fig. 11. A part of rootstock. X 1. 



