EXPLANATION OF THE PLATES. 



PLATES XXXVII-XLI. NARROW-LEAVED CHAIN-FERN. Lorinseria 

 areolata. Plate XXXVII. 1-7. Young leaves and plants in different stages 

 of development, i. Young plant attached to prothallus. Plate XXXVIII. i. 

 Mature sterile leaf. 2. Section of pinna of mature sterile leaf, X z\. Plates 

 XXXIX, XL. Leaves intermediate between the mature sterile and fertile 

 leaves. Plate XLI. i. Mature fertile leaf. 2. Section of fertile pinna, 

 X 2$. 



