PLATE V. 



FBRIn continued. 



Fig. 1. The Antheridium akd Antherozoids of the Royal Fern (Osnuinda Eegalis), under surfacs oi 



prntliallus (green). 

 Fig. 2. The Archegonium with its Central Cell or Germ-cell. 

 Fig. 3. Division of Central Cell into Four in the Bracken. 



Fig. i. Connection of young Bracken Fern with its Prothallus by means of the Foot. 

 Figs. 5, 6. Transverse and Longitudinal Sections of the Rhizome. Showing — 

 Sc.i. Outer scleren'cliyma (Gr. sJderos, hard; enchuma, tissue). 

 G. T. Ground tissue or pareu'chynia (Gr. pdra, together; enchuma, tissue). 

 F.- V. B. Fibro-vascular bundles — outer. 

 /St;. 2. Inner sclerenchvma. 

 G. T. Ground tissue. 

 F.- V. B. Fibro-vascular b\iudles — inner. 

 Fig. 7. Tr.\nsverse 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. sMevos, hard). 

 Fig. 8. Portion of Fibro-vascular Bundle. Showing — 

 Cells of fibro-vascular bundle sheath. 

 Cells of bast sheath with starch granules. 



I Bast fibres or liard bast. 

 Bast or PnLffiM ■; Bast vessels. ] 



( Bast parenchyma or procambiuni. J " " ' " ' 

 I Scalariform vessels. 

 'VTooD OR Xylem < Spiral vessels. 



( Wood parenchyma. 

 Note. — In the complete bundle the bast forms a ring snrroundiiig tlie wood. 



Fig. 9. Part of an Oblique Section of a Leaf-stalk. Showing tJie scalariform vessels (L. scala, a ladder^ 

 of the bundle. 



CLASSIFICATION OF FERN. 



Kinridom — PlantiB. 



Suh-Kingdom — Vascular Cryptogams (Gr. kruptos, hidden ; (juiiwk, a marriage). Vascular, 



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



hidden on an inconspicuous piothalhis. 

 Class — Filicinre. 

 Order — Filiccs. 



Genus — Pteris (Gr. pfei-cm, a wing). 

 Species — Aquilina (L. aquila, an eagle). 

 Common Name — Bracken Fern. 



