1 6 POLYPODIUM INCANUM. IIOARY TOLYrODY. 



unfold as in the unrolling of a coil. This latter mode is a very 

 beautiful form of growth, and the artist has happily caught our 

 specimen in the unfolding act. 



Explanation of the Pt-ATE. — i. A section of the scaly rhizome, with fronds showing the 

 upper and lower surfaces. — 2. Section of pinnule, enlarged three times, and showing the 

 sori and scales. 



