Explanation of Plate III. 



Trichomanes radicans Swz. p. 132. 

 Fig. 1. A frond with fragment of rootstock. X Y- 

 Fig. 2. A fertile pinna. X 1 

 Fig. 3. A small fertile pinnule with two sori. Magnified. 



Lygodium venuslum Swz. p. 135. 

 Fig 4. A fertile segment. X r - 



Fig. 5. A fertile pinnule (one of the pair constituting a pinna), show- 

 ing the dichotomous division of the stalk of the pinna. X Yz- 



