Fio. 2. Lateral Lines op Rhizome. 

 Fig. 3. Showing — 



t Eachis (Gr. rachis, a spine, ridge). 

 a. Part of Leaf or Fronti . . . . < Pinna (L. a feather). 



\ Pinnule (L. pinmda, a little feather). 



, „ ,, f Indusium (L. indueye, to clothe) covering spore-cases. 



h. Two Pinnules VIEWED from below -^ „ ,,^ ^ , ' ,' ^ 



[ 8orus (ur. soros, a lieaji), a cluster oi spore-cases. 



Fif:. 4. Showing Forked Venation and Indusium. 



Fui. 5. Spore-case or Sporangium. Showing — 



Stalk. 



Case. 



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



Spores. 

 Fig. G. Spore. Showing— 



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



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



Protoplasm with oil-gloLules. 



Nucleus. 

 Fig. 7. Development of Spore. Showing — 



a. Endosporium protruded. 



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



c. Old prothallus with root-hairs, male organs or autheridia, and female organs or arclipgonia 

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

 Fig. 8. Prothallus under high power. Showing — 



r Cell-wall. 



_, J Protoplasm. 



I Clilorophyll granules. 



l^Large vacuoles filled with cell-sap. 



