216 A TEXT-BOOK OF BOTANY 
203, D). Such a gametophyte has become so small that 
it can be seen only under the microscope. Among the 
cells formed, however, 
are two sperms. These 
sperms have no cilia, and 
hence it is evident that 
they do not reach the egg 
by swimming. 
The single large spore 
within the ovule (spo- 
rangium) is peculiar in 
never leaving it; that is, 
it is never shed, as are 
other spores. It pro- 
duces a many-celled fe- 
malegametophyte, justas 
does Selaginella (§ 118); 
and on this gametophyte 
archegonia are formed 
(Fig. 205). Since the 
Fic. 205.— A. section showing the relative po- large spore is not shed, 
sitions of bract (b), scale (s), and ovule (0) 
in a pine cone, the female gametophyte (g) the female gametophyte 
being very young; 8B, enlarged section it produces lies embed- 
through the ovule a year later, showing the 
female gametophyte (g) bearing two arche- ded in the center of the 
gonia (a) which are being reached by the ovule, like an internal 
penetrating pollen tubes (t). 
parasite (Fig. 205, q). 
It is evident now why the gametophytes of such plants 
are not ordinarily seen, for one is within the pollen grain 
and the other is within the ovule. 
125. Fertilization.— Before fertilization can take place, 
the pollen grain, which develops the male gametophyte with 
its sperms, must be brought to the ovule, which contains 
the female gametophyte with its archegonia. The pollen 
grains (microspores) are formed in very great abundance, 
are dry and powdery, and are scattered far and wide by 
