224 A TEXT-BOOK OF BOTANY 
134. Stamens.—F rom 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 
Frc. 210.—Front (4) and @nther usually shows that it contains 
back (8) views ofasta~ four sporangia, that is, four regions in 
men, showing filament i J 
(f) and anther (p), the Which spores are formed (Fig. 211). 
latterineluding twopol- As the anther matures, the two re- 
len sacs.—After ScHim- ; ‘ 
PER. gions on each side run together, so 
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Fic. 211.—Cross-section of a very young anther of a lily, showing the four de- 
veloping sporangia. 
