318 



BOTAXY: PRINCIPLES AND PROBLEMS 



well anchored in the thallus by its foot. Just above the foot is 

 a growing region, through the activity of which the sporophyte 

 continues to elongate during the whole season. The spores at 



Fig. 192. — The sporophyte of Anthoceros. Longitudinal section of basal 

 portion, showing the large foot, embedded in the gametophyte. The spore-bear- 

 ing tissue surrounds the sterile columella within, and is surrounded by a layer of 

 sterile, chlorophyll-bearing tissue without. The base of the sporophyte con- 

 tinues to grow, adding progressively to these various tissues. 



the tip ripen first, and ripening proceeds slowly downward, the 

 spore-case gradually splitting into halves (Fig. 191). Its internal 



