This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
Rhizome creeping. Frond coriaceous, 3- or 4-pinnate; veins free. Sori marginal, continuous. Indusium membranous, confluent with the recurved margin. A large genus containing about eighty species, found in all parts of the world except the very coldest. The name is from a wing, in allusion to the form of the fronds.
1. P. aquillna. Brake or Bracken. - It is unnecessary to describe this the commonest of all native Ferns in detail. In different situations its fronds vary from 1 to 8 feet or more high, with a tall stout stipes. This Fern is found in nearly all parts of the world.