FACTORS OF INCREASE 125 
Ophioglossaceae and Filices, and in these the continued apical growth may 
largely devolve upon the sporophylls. The consequence of such growth 
is increased accommodation for sporangia. Similarly, continued intercalary 
growth may effect the same end: as in the sori of those Ferns designated 
Fic. 67. 
A forked sporangiferous branch of Lycopodium chamecyparissus in longitudinal section, 
slightly magnified. =the axile vascular body. 4é=leaves. ss=young sporangia. 
the Gradatae. These serve as examples of the way in which, by continued 
growth of the parts which bear the sporangia, a sequence of these may be 
produced, which may be continued so long as the growth itself. It is clear 
from the examples adduced that such continued growth may occur in parts 
which are not morphologically comparable. In the more primitive Pterido- 
phytes it is answerable for extensive increase in accommodation for primordia 
of sporangia. 
