Tab. CCXV. 



AspiDiuM (Polystichum) tridens. Hook. — p. 15. 



Tuft of fronds, sterile and fertile ; nat. size. Fig. 1 . Fertile 

 pinna. Fig. 2. Involucre, seen from above. Fig. 3. Invo- 

 lucre, side view. Fig. 4. Scale from the stipes ; luaynified. 



