Gymnocarpium robertianum

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Gymnocarpium robertianum

Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Polypodiales
Suborder:	Aspleniineae
Family:	Cystopteridaceae
Genus:	Gymnocarpium
Species:	G. robertianum
Binomial name
*Gymnocarpium robertianum* (Hoffm.) Newman
Synonyms
Dryopteris robertiana (Hoffm.) C. Chr. Gymnocarpium dryopteris (L.) Newman var. pumilum (DC.) B.Boivin Phegopteris robertiana (Hoffm.)A. Braun ex Asch.

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 × achriosporum Sarvela. 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]

References

^ BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
^ NRCS. "Gymnocarpium robertianum". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 19 January 2016.
^ Stace, Clive (1997). New Flora of The British Isles, second edition. Cambridge: Cambridge University Press
^ ^a ^b Gymnocarpium robertianum at Flora of North America
^ Gymnocarpium robertianum at PLANTS profile
^ [1] List of protected plants at National Botanic Gardens of Ireland
^ [2] Archived 2011-08-17 at the Wayback Machine Abstract on Gymnocarpium robertianum in Michigan

External links

Gymnocarpium robertianum at Flora of North America [3]
Distribution of Gymnocarpium robertianum in the British Isles at BSBI maps [4]
Gymnocarpium robertianum at Hardy Fern Library [5] Archived 2011-07-09 at the Wayback Machine

Taxon identifiers

Gymnocarpium robertianum

Wikidata: Q2092520
Wikispecies: Gymnocarpium robertianum
APDB: 130563
BioLib: 3159
CoL: 3HQVR
EoL: 597247
EPPO: GMNRO
EUNIS: 150359
FNA: 200003907
GBIF: 2650841
iNaturalist: 163450
IPNI: 17112130-1
IRMNG: 11161971
ITIS: 17581
MichiganFlora: 530
NatureServe: 2.157241
NBN: NBNSYS0000002084
NCBI: 983334
Observation.org: 2549
Open Tree of Life: 682249
PFI: 116
Plant List: tro-26602286
PLANTS: GYRO
POWO: urn:lsid:ipni.org:names:17112130-1
Tropicos: 26602286
VASCAN: 5417
WisFlora: 3785
WFO: wfo-0001109141

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