Tab. XVII. 



A. Cyathea Dregei, /3. Hook.—Tp. 23. 



Fig. 1, 2. Fertile pinna ; nat. size. Fig. 3. Segment of ditto, 

 under side ; magnified. Fig. 4. Sorus ; more magnified. 



B. Cyathea Burkei, Hook. — p. 23. 



Fig, 1. Fertile pinna; nat. size. Fig. 2. Segment of ditto; 

 magnified. Fig. 3. Sorus j more magnified. Fig. 4. Baso 

 of the stipes ; nat. size. 



