I. POLYPODIUM. 
45 
[P. vulgare /3 and 7] 
on the lower part are 
deeply lobed. 
Other slight varia- 
tions occur. One of 
these, with taper- 
pointed lobes, is called 
acutum; and the var. 
bifidum is sometimes 
more than two-lobed, 
and is then called pro- w 
liferum. 
The Common Poly- 
pody has a creeping 
caudex, as thick as 
one's finger, densely 
covered while young 
with brown taper- 
pointed paleaceous 
deciduous scales, be- 
coming bare in age, 
and throwing out, as 
it progresses, densely 
hairy branching 
Sometimes entire 
fronds of the variety e 
are deeply crenate-ser- 
rate when it is the var. 
sinuatum of Willdenow. 
At other times the up- 
per part of the frond 
only is thus crenated, 
while the primary lobes 
[P. cambricum.] 
