British Pteridological Society. Special Publication No. 16.
A comprehensive study of the genus Polypodium. Martin gives well-written descriptions of each species and cultivar worldwide, illustrated with excellent photographs. All known species, hybrids and cultivars of Polypodium worldwide are included and the true identities of many ares discussed in detail.
A great addition to a burgeoning fern literature home library. It would make a great gift for all your fern friends!