PLATE XI. 



FIG. 113. 



Antheridia of Chara fragilix: A, antheridium or "globule" developed at the base of pistillidinm or 

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



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

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

 G is shown the escape of the mature autherozoids, 11. (From Carpenter.) 



Development of Prothalium of Plerix serruJnta: A, spore set free from the theca; B, spore beginning 

 to germinate, putting forth the tubular prolongation n, from the principal cell b; c, fi-st formed linear 

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

 fibre ; c, </, the two lobps. and e the indentation between them ; /, /', first-formed part of the prothallium ; 

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



