174 



KNOWT.FDr.K. 



June, 1915. 



PQQq) 



Figure 157. 



Genninatod oospore of 

 ()cilof;oiiiiini. sliowiiij; 4 

 zoospores ready to escape. 



I'lf.l'Klc 158. 



/vKote of Spirogyra in 



whicli ihe nucleus has 



divided into 4, i d.aughter 



nuclei dei^eneralinj,'. 



FiGUKi; I5y. 



The archeyoniuin and 



fertilisation in the 



Hryophyta. 



FiGUKK 160. 



Higher type of sporoKoniuni. 



showing some sterilisation : 



/ absorbing foot, e mass of 



elaters. 



Figure 161. 



A Moss plant — two genera- 

 tions. The sporophyte a is 

 dependent on the gameto- 

 phyte b. 



1' I CURE 162. 



The type of " fruit -body," 



or sporogoniuEn, found in 



Riccia, and so on. 



Figure 163. 



Section of capsule of Moss, 

 showing the relatively great 

 amount of sterile tissue. 

 S = the spore-producing layer. 



-^ Plant 



Livirwori orMoi: 



iSjborc 



T 1 



froro (font u»i 



Cafirufc f .r/o« 





Sj^rmahjoid £'of ,>, Ooi/icn 



I 



Oospore ¥ - 



perhtit scd Eq^ 



I'IGURE 164. 



Prothallus 



0pores 



S/borortQi 



Anthtrictium ArcTit^ontum 





"-Plant" 



FiGURh 165. 



Illustrates diagrammatically the life-cycle of a Liverwort or Life-cycle of a typical Fern. Sporophyte underlined as in 

 Moss. The sporophyte generation is underlined. Figure 164. 



