88 HOW TO KNOW THE FERNS 



sori. These are disposed on both sides of the 

 mid-ribs of the lobes ; they are circular in shape 

 and have no indusia or covering of any kind. 

 When the sporangia are young the sori are of a 

 very pale yellow colour ; this changes to a rich 

 golden-brown as the capsules mature. The sori 



Enlargement of the sori on the frond of Common Polypody. 



are mostly confined to the upper portion of the 

 frond, and on account of their bright colouring 

 add very much to the appearance of the leaf. 

 There are a large number of varieties of the 

 Common Polypody. 



The Common Polypody will, of course, grow 

 in almost any position. It often finds a home 



