THE LIFE OF A FERN. 



est amount of tissue possible, as in the Onoclea. 

 Among plants of Osmunda cinnamomea a curious 

 form is often found, where portions of the fertile 

 frond have developed sterile leaflets (pinned), re- 

 sembling somewhat O. Claytbniana in appearance, 

 and showing that the fertile is but a differentiated 

 sterile frond. 



