Ferns

Arthropsida
Eusporangiopsida
Fern
Filicatae
Filices
Filicineae
Filicophyta
Filicopsida
Leptosporangiate ferns
Marattiopsida
Monilophyta
Polypodiophyta
Polypodiopsida
Psilopsida
Psilotopsida
Pteridopsida
Pterophyta

ITIS, Jan. 23, 2002 (Scientific name: Pterophyta. Vernacular name: ferns)
Lawrence, E. Henderson's dict. of biol. terms, 2000 (fern: common name for a member of the Pterophyta; Pterophyta: one of the four major divisions of the spore-bearing vascular plants, commonly called the ferns)
Academic Press dict. of sci. and tech., via WWW, Jan. 23, 2002 (fern: The common name for a seedless, nonflowering vascular plant of the class Filicineae; Filicophyta: the ferns; Filicopsida: the largest of three subdivisions of the division Filicophyta; Filicineae: a class of the Pteridophyta; plants that reproduce by spores and are characterized by fronds and true vascular systems)
The Wordsworth dict. of sci. & tech., 1995 (ferns (Bot.). Pteridophytes of the class Filicopsida)
McGraw-Hill dict. of sci. tech. terms, c1989 (fern (BOT) Any of a large number of vascular plants composing the division Polypodiophyta)
Encarta world Eng. dict. (fern: n. pl. ferns or fern)
ITIS, Nov. 15, 2023 (Class Polypodiopsida -- leptosporangiate ferns. Subdivision Polypodiophytina, Division Tracheophyta -- vascular plants, tracheophytes. Synonyms: Psilotopsida, Arthropsida, Eusporangiopsida, Equisetopsida, Filicopsida, Psilopsida, Marattiopsida)
Britannica online, Nov. 15, 2023 (fern, (class Polypodiopsida), class of nonflowering, herbaceous vascular plants that possess true roots, stems, and complex leaves and that reproduce by spores)
Wikipedia, Nov. 15, 2023 (The ferns (Polypodiopsida or Polypodiophyta) are a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers; Synonyms: Filicatae, Filices, Filicophyta, Monilophyta, Pteridopsida)