DEVELOPMENT OF PLANTS 277 



its nucleus forms a globular mass of cells, the capsule, wiihin the 

 archegonium which keeps pace with its growth (Fig. 183, A, B). 

 The wall cells of this capsule are soon cJistinguishal)le, owing to 

 their watery contents and shape, from the other cells, which arc 

 rather cubical and densely granular. The growth and division 

 of the granular cells continues until about 400 have been formed, 

 when they round off, become separated from one another and 

 increase greatly in size (Fig. 183, C). These large r.Hs, r.ill,<| 





■:-n vA 



Fig. 183. Germination of the ganu'tosport": -1, lias^il portion of an arche- 

 gonium, showing the germinating gametospore in the lour-cell stage, B, 

 later growth, forming a capsule with wall cells, w, which inclose large gran- 

 ular cells. C, a portion of the capsule, showing spore niotht-r cells roun' m .• 

 ofif and floating in the fluid of the capsule. D, the mother cells dJM ...s 

 and forming four spores each. — II. O. Hanson. 



Spore mother cells, form four spores each, as in the tctrasporcs 

 of the red algae (Fig. 183, D). The delicate walls of the cap- 

 sule break down as soon as the spor<>^ in- m nnnd. leaving them 



