1) Family osmundaceae 2) Fern family 
The Osmundaceae (Royal Fern Family) is a family of four genera and 15-25 species. It is the only fern family of the order Osmundales an order in the class Polypodiopsida (Filicopsida, Pteridopsida, or Leptosporangiate ferns) or in some classifications the only order in the class Osmundopsida. This is an ancient (known from the Upper Permian) and f...
the royal fern family, the only family of the fern order Osmundales. A primitive group consisting of three present-day genera of large ferns—Osmunda, ... [1 related articles]
[n] - large family of ferns widely distributed in temperate and tropical areas
family Osmundaceae noun large family of ferns widely distributed in temperate and tropical areas