Tab. CCXV.

Aspidium (Polystichum) tridens, Hook. —p. 15.

Tuft of fronds, sterile and fertile; nat. size. Fig. 1. Fertilepinna. Fig. 2. Involucre, seen from above. Fig. 3. Invo-lucre, side view. Fig. 4. Scale from the stipes ; magnified.