Dryopteris intermedia

Dryopteris intermedia

Secure  (NatureServe)[1]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Polypodiales
Suborder: Polypodiineae
Family: Dryopteridaceae
Genus: Dryopteris
Species:
D. intermedia
Binomial name
Dryopteris intermedia
(Muhl. ex Willd.) A.Gray
Synonyms[2][3][4]
  • Polypodium intermedium (1810)
  • Aspidium americanum (1878)
  • Aspidium intermedium
  • Dryopteris austriaca var. intermedia
  • Dryopteris spinulosa var. concordiana
  • Dryopteris spinulosa var. intermedia (1893)
  • Thelypteris spinulosa var. intermedia

Dryopteris intermedia, the intermediate wood fern or evergreen wood fern,[4][3] is a perennial, evergreen wood fern native to eastern North America. It is a diploid species, and is the parent of several species of hybrid origin, including Dryopteris carthusiana. Other common names for this species include intermediate shield fern, fancy wood fern, fancy fern, glandular wood fern, American shield fern and common wood fern.[2][3][5][6]

This fern is often confused with several other wood fern species, including D. carthusiana, D. campyloptera, and D. expansa. It especially extensively shares the range of D. carthusiana, but the two may be distinguished by the innermost pinnule on the bottom side of the bottom pinna: this pinnule is longer than the adjacent pinnules in D. carthusiana, but shorter or even in D. intermedia.

  1. ^ "NatureServe Explorer 2.0 - Dryopteris intermedia Evergreen Woodfern". explorer.natureserve.org. Retrieved 9 October 2020.
  2. ^ a b Lord Britton, Nathaniel; Brown, Addison (1970). Ophioglossaceae to Polygonaceae; ferns to buckwheat. Courier Corporation. p. 22. ISBN 0486226425.
  3. ^ a b c "Dryopteris intermedia - Database of Vascular Plants of Canada (VASCAN)". VASCAN. Retrieved 2020-10-16.
  4. ^ a b USDA, NRCS (n.d.). "​Dryopteris intermedia (intermediate woodfern)​". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 2020-10-16.
  5. ^ "Dryopteris intermedia (Glandular Wood Fern)". MinnesotaWildflowers.info. Retrieved 2020-10-09.
  6. ^ "Dryopteris intermedia (Evergreen Wood Fern, Fancy Fern, Glandular Wood Fern, Intermediate Shield Fern, Intermediate Wood Fern)". North Carolina Extension Gardener Plant Toolbox. Retrieved 2020-10-09.