PLATE V. 



FB.LV.N continued. 



FIG. 1. THE ANTHERIDIUM AND ANTHEROZOIDS OF THE ROYAL FERN (Osmunda Regalis), under surface ol 



prothallus (green). 



FIG, 2. THE ARCHEGONIUM WITH ITS CENTRAL CELL OR GERM-CELL. 

 FIG. 3. DIVISION OF CENTRAL CELL INTO FOUR IN THE BRACKEN. 



FIG. 4. CONNECTION OF YOUNG BRACKEN FERN WITH ITS PROTHALLUS BY MEANS OF THE FOOT. 

 FIGS. 5, 6. TRANSVERSE AND LONGITUDINAL SECTIONS OF THE KHIZOME. Showing 

 Sc.i. Outer scleren'chyma (Gr. skleros, hard; enchuma, tissue). 

 G. T. Ground tissue or paren'chyma (Gr. para, together ; enchuma, tissue). 

 F.-V. B. Fibre- vascular bundles outer. 

 Sc. 2 . Inner sclerenchy ma. 

 G. T. Ground tissue. 

 F.- V. B. Fibro-vascular bundles inner. 

 FIG. 7. TRANSVERSE AND LONGITUDINAL SECTIONS OF RHIZOME. Showing 



Epidermis, sub-epidermis, and parenchyma loaded with starch granules. 

 Fibro-vascular bundle with scalariform and spiral vessels. 

 Parenchyma with starch. 



Sclerenchyma very thick walled (Gr. skleros, hard). 

 FIG. 8. PORTION OF FIBRO-VASCULAR BUNDLE. Showing 

 Cells of fibro-vascular bundle sheath. 

 Cells of bast sheath with starch granules. 



f Bast fibres or hard bast. 



BAST OR PHLCEM < Bast vessels. "j 



( Bast parenchyma or proeambium. j 

 ( Scalariform vessels. 

 WOOD OR XYLEM -I Spiral vessels. 



( Wood parenchyma. 

 Note. In the complete bundle the bast forms a ring surrounding the wood. 



FIG. 9. PART OF AN OBLIQUE SECTION OF A LEAF-STALK. Showing the scalariform vessels (L. scala, a ladder* 

 of the bundle. 



CLASSIFICATION OF FERN. 



Kingdom Plantae. 



Sub-Kingdom Vascular Cryptogams (Gr. kruptos, hidden ; gamos, a marriage). Vascular, 



because they possess fibro-vascular bundles ; cryptogams, because the sexual organs are 



hidden on an inconspicuous prothallus. 

 Class Filicinas. 

 Order Filices. 



Genus Pteris (Gr. pteron, a wing). 

 Species Aquilina (L. aquila, an eagle). 

 Common Name Bracken Fern. 



B 



