Gymnocarpium robertianum

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Gymnocarpium robertianum
Gymnocarpium robertianum, Ireland.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Polypodiales
Suborder: Aspleniineae
Family: Cystopteridaceae
Genus: Gymnocarpium
Species:
G. robertianum
Binomial name
Gymnocarpium robertianum
Synonyms

Dryopteris robertiana(Hoffm.) C. Chr.
Gymnocarpium dryopteris(L.) Newman
var. pumilum(DC.) B.Boivin
Phegopteris robertiana(Hoffm.)A. Braun ex Asch.

Contents

Gymnocarpium robertianum, the limestone fern [1] or scented oakfern, [2] is a fern of the family Cystopteridaceae.

Description

Gymnocarpium robertianum has small (10–50 cm), deltate, two- to three-pinnate fronds. Fronds arise from creeping rhizomes and have long, delicate rachis. The sori are borne in round clumps on the underside of the blade and lack an indusium. This species differs from the closely related G. dryopteris in having a densely glandular rachis as well as a more sparsely glandular underside to the blade. [3]

Gymnocarpium robertianum is thought to hybridise with G. appalachianum giving rise to Gymnocarpium × heterosporum W. H. Wagner . This hybrid was only known from Pennsylvania where it has now been eradicated. The hybrid between G. robertianum and G. dryopteris is called Gymnocarpium × achriosporumSarvela. This taxon is known from Sweden and Quebec. [4]

Distribution and habitat

Gymnocarpium robertianum is a circumboreal species with populations in Europe, North America and the Caucasus Mountains. [4]

This species is protected in Illinois and Michigan [5] and is protected under the Flora Protection Order in Ireland. [6]

This species is a calcicole and as such is restricted to alkaline rich areas. In the British Isles its preferential habitat is grykes in limestone pavement. In Michigan the species is most frequent in Thuja occidentalis swamps. [7]

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<i>Gymnocarpium dryopteris</i> Species of fern

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<i>Dryopteris affinis</i> Species of fern in the family Dryopteridaceae

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<i>Dryopteris marginalis</i> Species of fern

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<i>Dryopteris carthusiana</i> Species of fern

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<i>Dryopteris cristata</i> Species of fern

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<i>Dryopteris intermedia</i> Species of wood fern

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<i>Dryopteris dilatata</i> Species of fern

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<i>Hymenophyllum tunbrigense</i> Species of fern

Hymenophyllum tunbrigense, the Tunbridge filmy fern or Tunbridge filmy-fern, is a small, fragile perennial leptosporangiate fern which forms large dense colonies of overlapping leaves from creeping rhizomes. The common name derives from the leaves which are very thin, only a single cell thick, and translucent, giving the appearance of a wet film. The evergreen fronds are bipinnatifid, deeply and irregularly dissected, about 3 to 6 cm long, 2 cm across with dark winged stipes. In contrast to the similar H. wilsonii the fronds are more divided, flattened, appressed to the substrate and tend to have a bluish tint.

<i>Dryopteris aemula</i> Species of fern

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References

  1. BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
  2. USDA, NRCS (n.d.). "Gymnocarpium robertianum". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 19 January 2016.
  3. Stace, Clive (1997). New Flora of The British Isles, second edition. Cambridge: Cambridge University Press
  4. 1 2 Gymnocarpium robertianum at Flora of North America
  5. Gymnocarpium robertianum at PLANTS profile
  6. List of protected plants at National Botanic Gardens of Ireland
  7. Archived 2011-08-17 at the Wayback Machine Abstract on Gymnocarpium robertianum in Michigan