Tab. XVIII. 



A. Alsophila excelsa, Br. — p. 49. 



Fig. 1, Fertile portion of a frond; nat. size. Fig. 2. Segment 

 of the same, under side ; magnified. Fig. 3. Portion of a 

 sterile pinna ; nat. size. Fig. 4. Segment of ditto ; mag- 

 nijied. Fig. 5. Portion of the stipes ; nat. size. 



B. Alsophila contaminans. Wall — p. 52. 



Fig. 1. Fertile portion of frond; nat. size. Fig. 2. Segment 

 of ditto, under side ; magnified. Fig. 3. Upper side of 

 ditto ; magnified. 



