PLATE XI 



FIG. 113. 



Antheridia of Chara fragilis : A, antheridium or "globule" developed at the base of pistillidium or 

 " nucule ;" B, nucule enlarged, globule laid open by the separation of its valves; c, one of the valves, 

 with its group of antheridial filaments, each composed of a linear series of cells, within every one of 

 which an antherozoid is formed ; in D, E, and F, the successive stages of this formation are seen ; and at 

 G is shown the escape of the mature antherozoids, H. (From Carpenter.) 





Development of Prothalium of Pteris serrulata : A, spore set free from the theca; B, spore beginning 

 to germinate, putting forth the tubular prolongation a, from the principal cell b; r, first formed linear 

 series of cells ; D, prothallium taking the form of a leaf-like expansion ; a first and 6 second radical 

 fibre ; c, d, the two lobes, and e the indentation between them ; /, /, first-formed part of the prothallium ; 

 g, external coat of the original spore ; h, A, antheridia. (From Carpenter.) 



