8 



Fia. 2. LATERAL LINES OF RHIZOME. 

 FIG. 3. Showing 



i Rachis (Gr. rachis, a spine, ridge). 

 a. PART OF LEAF OR FROND . . . . < Pinna (L. a feather). 



I Pinnule (L. pinnula, a little feather). 



. m TI f Indusiuni (L. induere, to clothe) covering spore-cases. 



I. Two PINNULES VIEWED FROM BELOW { * 



( Sorus (Gr. soros, a heap), a cluster oi spore-cases. 



FIG. 4. Showing FORKED VENATION AND INDUSIUM. 

 FIG. 5. SPORE-CASE OR SPORANGIUM. Showing 



Stalk. 



Case. 



Anmilus (L. a ring). In c, a small part below the spores is inadvertently uncoloured. 



Spores. 

 FIG. C. SPORE. Showing 



Exosporium (Gr. exo, outside ; spora, a seed). 



Endosporium (Gr. endun, within ; spora, a seed). 



Protoplasm with oil-globules. 



Nucleus. 

 FIG. 7. DEVELOPMENT OF SPORE. Showing 



a. Endosporium protruded. 



6. Divided to form a young prothallus, with root-hairs. 



c. Old prothallus with root-hairs, male organs or antheridia, and female organs or archegonia 



(Gr. archos, chief; gone, seed). 

 FIG. 8. PROTHALLUS UNDER HIGH POWER. Showing 



C Cell-wall. 



CELLS . . J Prot P lasm - 



' | Chlorophyll granules. 



L. Largo vacuolcs filled with cell-sap. 



