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CointoN Polypody. Folypodium vulgare. 
See page 27 . 
1. Serrated Common Polypody. Serratum, This variety 
differs from the common form in having many leaflets 
coarsely serrated. The large, deep, blunt, coarse teeth of a 
carpenter’s saw may be considered a representation of the 
edge of several leaflets belonging to this plant. Sometimes 
the teeth are also serrated, and therefore we may call the 
plant biserrate. Some of the clusters of spores are not 
perfectly round and have a tendency to become oblong. 
This plant is not uncommon. 
2. Pinely Serrated Polypody. Serrulatum, This Pern 
has on its margin very fine and minute teeth, resembling 
those of a cabinet-maker’s saw. In other respects there is no 
difference between this and the ordinary appearance of the 
Common Polypody. 
3. Notched Common Polypody. Crenatmn, This Pern 
is wider than the usual forms of the Polypody. It may be 
described as egg-shaped, and not lance-shaped. While, in 
its common aspect, a frond eight inches long is two and a 
half inches broad in its widest part — here a frond of the 
same length may at one place be five inches broad. The 
lobes or notches of the leaflets are not sharp-pointed, as 
the teeth of a saw, but rounded, and are also waved. Some 
of the clusters are not round, but oblong. This has been 
found at Hawkchurch. M. 
4. Porked Common Polypody. 'Bifidvm, Some of the 
lobes are forked at their ends, especially at the lower part 
of the frond. In some luxuriant specimens they are three- 
forked or even more divided, but this happens irregularly 
and unequally, while their extremities are at times blunt 
and at times sharp-pointed. The mid-vein separates into 
each fork, and if it be fertile, the clusters of fruit are on 
each side of the separated mid-vein. This variety is 
occasionally found in most parts of this district. 
5. Auricled Common Polypody. Auritum, At the base 
of the segments or lobes on the upper side near the mid-vein 
is a little round lobe or auricle. In our plants we do not 
find it on every segment, but chiefly on the lower ones. 
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