224 



A TEXT-BOOK OF BOTANY 



134. Stamens. From our study of Gymnosperms ( 123), 

 the stamen of the Angiosperm flower is recognized as a spo- 

 rophyll bearing sporangia, which pro- 

 duce the small spores (microspores) 

 called pollen grains. The stamen of 

 Angiosperms, however, has two very 

 distinct regions. There is a stalk, 

 which is usually slender and long, 

 called the filament; and at the top of 

 this there is the knob-like sporan- 

 gium-bearing region called the anther 

 (Fig. 210). 



A cross-section of a very young 

 FIG. 210. Front (A) and anther usually shows that it contains 

 back (5) views of a sta- f OU r sporangia, that is, four regions in 



men, showing filament . . 



(/) and anther ( P ), the which spores are formed (Fig. 211). 



latter including two pol- Ag the ant h er matures, the tWO T6- 

 ien S3-CS. Alter OCHIM -% 



PER. gions on each side run together, so 



FIG. 211. Cross-section of a very young anther of a lily, showing the four de- 

 veloping sporangia. 



