WHERE TO FIND FERNS. 



the leafy part, and to show also the hairiness of the 

 stem from which it springs and the incisions of the leafy 



margin. The shape of the 

 sorus differs in different ferns. 

 It is mostly rounded; but in 

 some ferns, as shown in the 

 subjoined illustration of a 

 portion of a frond of the Male 



Fern (Lastrea filix-mas\ it is 

 kidney-shaped. The annexed 

 figure, much enlarged from the 

 natural size of a portion of a 

 Male Fern frond, shows very 

 clearly both the shape (and the 

 position with regard to the 

 veins) of the sorus. 



Sometimes the sori are pro- 

 tected by scale-like coverings. 

 Each such covering protecting 

 a sorus is named an indusium. 

 On page 15 is a drawing of an 

 indusium of a sorus of the Broad 

 Buckler Fern, one of the 

 Lastreas. It is much magnified, 

 but shows clearly the kidney shape and the jagged 



