48 



BRITISH CHAEOPHTTA. 



The chlorophyll-granules become yellowish-orange to 

 red as the antheridium matures. 



The foot-stalk (Fig. 18 6), styled the flask-cell, is 

 more or less flask-shaped, the narrower end projecting 

 far into the interior of the antheridium. In the 

 Nitellese, between the flask-cell and the node-cell, an 

 extra cell (Fig. 18 c) is present. 



Fio. 19. — Mature antheridium (after Prosper), i. Chara hispida. 

 ii, iii. Chara tomentosa. i. General exterior view. ii. Interior view 

 of single plate or shield with manubrium attached, iii. Apex of 

 manubrium with primary (a) and secondary (b) head-cells and 

 filaments (c) containing antherozoids. 



From the centre of each of the plates on its inner 

 side an elongated cell, called the manubrium, projects 

 inwards towards the centre of the antheridium 

 (Fig. 19 ii). The manubrium as well as the flask- 

 cell contain chlorophyll. At the distal end of each 

 manubrium there is a nearly globular colourless cell, 

 styled the capitulum or head-cell (Fig. 19 iii a). From 

 this head-cell proceed about four to six subglobular 

 or elongated cells, the secondary capitula (b), each of 

 which gives rise to a variable number (usually two 



