Definition

Proper noun A taxonomic family of ferns, known as the true polypody ferns. It is a large and diverse family that, in some historical or alternative classification systems, has been subdivided into several smaller, distinct families.

Examples of Usage

• The common polypody fern, , is a classic member of the family Polypodiaceae.
• Botanists reclassified many ferns formerly placed in the Polypodiaceae into more specific families.
• The study focused on the spore morphology across genera within the Polypodiaceae.

Advanced Usage

• In taxonomic discussion: The term is used to discuss the historical breadth of the family and its subsequent division in modern phylogenetics.
  • The circumscription of the family Polypodiaceae has narrowed significantly with the advent of molecular data.
• As a type specimen: Used to specify the familial classification of a particular fern.
  • The specimen was definitively identified as belonging to the Polypodiaceae.

Variants and Related Words

• Polypodiaceae (noun): The standard form, often used without the word "family."
  • Ferns of the Polypodiaceae are often epiphytic.
• Polypod fern (noun): A common name for ferns in this family.
• Polypod (adjective): Relating to this family.
  • The polypod ferns exhibited a distinct rhizome structure.

Synonyms

• Polypody family (noun): A common English name for the taxonomic family.
• (Historical) Broad Polypodiaceae (noun phrase): Refers to the older, more inclusive concept of the family before reclassification.

Notes on Different Meanings

This term has a single, specific meaning in scientific (botanical/biological) context. Its definition is tied directly to biological taxonomy. The "different meanings" relate to its changing scope within scientific history: 1. Traditional/Broad Sense: A very large family encompassing many fern groups (as indicated in the reference context, including groups like Dryopteridaceae). 2. Modern/Strict Sense: A more narrowly defined family, primarily containing the polypodies and their closest relatives.

Noun

1. ferns: a large family that in some classification systems has been subdivided into several families (including Aspleniaceae and Blechnaceae and Davalliaceae and Dennstaedtiaceae and Dryopteridaceae and Oleandraceae and Pteridaceae)