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Polypody    Polypodium interjectum or vulgare    18
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City of London Cemetery, 4 November 2006
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Polypody ferns are quite common in the cemetery, usually growing from the slabs of gravestones.
Without microscopic investigation it is difficult to tell the difference between P. interjectum and P. vulgare, but it is said that the former is more likely to be found on limestone or mortared walls, which would be the case in the cemetery.