Explanation of Plate XVII. 



Hemitelia grandifolia (Willd.) Spreng. p. 167. 

 Fig. 1. Two lobes of a pinna. The sori art usually more regularly- 

 arranged. X i. 



Hemitelia nigricans Presl. p. 167. 

 Fig. 2. Two pairs of pinnules, with winged secondary rachis. X 1. 

 Fig. 3. A larger pinnule. X I. 



Alsophila p/iegopteroides Hook, p. 168. 

 Fig. 4. A pinna with piece of scaly rachis. 

 Fig. 5. A scale from tne rachis. Magnified. 



Alsophila infesta Kze. p. 168. 

 Fig. 6. Two pinnae showing the abrupt change from twice-pinnate to 

 once pinnate division toward the -apex of the frond. X I. 



