EXPLANATION OF THE PLATES. 
Pirates XXI, XXII.—SrenpeR Cuirr-BRakE. Cryptogramma Stellert. 
Plate XXI.—1-8. Leaves in different stages of development. Plate XXII.— 
1. Mature fertile leaf. 2. Mature sterile leaf. 3. Section of fertile leaf, X 24. 
