EXPLANATION OF THE PLATES. 



PLATES VIII-XI. PURPLE CLIFF-BRAKE. Pellcea atropurpurea. Plate 

 VIII. i. Young plant attached to prothallus. 2-5. Young leaves in early 

 stages of development. Plate IX. i, 2. Young fertile leaves. Plate X. 

 Mature highly developed sterile leaf. Plate XI. i. Mature highly developed 

 fertile leaf. 2. Fertile pinnule, X 2\. 



