Woodsia ilvensis

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Oblong woodsia
Woodsia ilvensis Moore47A.png
Status TNC G5.svg
Secure  (NatureServe)
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Polypodiales
Suborder: Aspleniineae
Family: Woodsiaceae
Genus: Woodsia
Species:
W. ilvensis
Binomial name
Woodsia ilvensis
Synonyms

Acrostichum ilvenseL. (basionym)

Woodsia ilvensis, commonly known as oblong woodsia, [3] is a fern found in North America and northern Eurasia. Also known as rusty woodsia or rusty cliff fern, it is typically found on sunny, exposed cliffs and rocky slopes and on thin, dry, acidic soils. [2] [4] [5] [6]

Contents

Distribution

Its distribution is circumpolar. It is most abundant in Scandinavia, the Ural and Altai mountains and the eastern United States. [6] It is also found in Japan, [4] Alaska, Canada, coastal Greenland and various European locations including the Alps.

It is considered "Threatened" or "Endangered" in the states of Illinois, Iowa, and Maryland and "Presumed Extirpated" in Ohio. [1] [2] Also found in West Virginia and North Carolina, it is the most common Woodsia species in the US. [5]

Its UK distribution is confined to Angus and the Moffat Hills in Scotland, north Wales and Teesdale and the Lake District in England. [6] There are fewer than 90 wild clumps in the whole of the UK, where it is on the edge of its natural range and is considered to be "Endangered". [6] [7] For this reason it became a protected species in the UK in 1975 under the Conservation of Wild Creatures and Wild Plants Act. [8]

Discovery and identification

The plant was first identified as a separate species from specimens collected in Scotland in Bolton's 1785 publication Filices Britannica. Bolton distinguished between Acrostichum ilvense and Acrostichum alpina, now Woodsia ilvensis and Woodsia alpina respectively, which had previously been conflated. [6] The genus Woodsia was established in 1810 by Robert Brown, who named it after the English botanist Joseph Woods. [5] [6] "Ilvensis" is the genitive form of the Latin name for the island of Elba. [4]

The leaves are typically 6 inches long and 1 inch wide, with stiff, erected pointed tips and cut into 12 nearly opposite stemless leaflets. The underside of the leaves are covered in white woolly fibres, which later turn rusty brown. [9]

Victorian collectors and modern conservation

Oblong woodsia came under severe threat from Victorian fern collectors in the mid 19th century in Scotland, especially in the Moffat Hills. These hills once had the most extensive UK populations of the species but there now remain only a few small colonies whose future is under threat. This period of collecting became known as pteridomania (or "fern-fever"). The Royal Botanic Garden Edinburgh plan to use cultivated specimens and a spore bank to restore depleted wild populations. [6]

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Cystopteris dickieana, commonly known as Dickie's bladder-fern, is a fern with a wide distribution in the Northern Hemisphere. There is debate amongst botanists as to whether it is a species in its own right or a variant of C. fragilis.

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Woodsia neomexicana, the New Mexican cliff fern, is a fern species native to the Southwestern United States and northern Mexico.

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

Dryopteris fragrans, commonly known as the fragrant fern, a circumboreal fern found worldwide, is the smallest of the Dryopteris species. It can resemble Woodsia ilvensis in the wild, with which it shares the same habitat of rocky areas, shady cliffs, screes, and limestone talus.. It typically will not reach more than 25 cm in height, and accumulates dead fronds around its base.

References

  1. 1 2 "Woodsia ilvensis (L.) R. Br". PLANTS Profile. United States Department of Agriculture . Retrieved 18 June 2008.
  2. 1 2 3 "Woodsia ilvensis (Linnaeus) R. Brown, Trans. Linn. Soc. London, Bot. 11: 173. 1813". Pteridophytes and Gymnosperms. Flora of North America. 2. Oxford University Press. 1993. ISBN   978-0-19-508242-5 . Retrieved 18 June 2008.
  3. BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
  4. 1 2 3 Tom Stuart. "Woodsia ilvensis". Hardy Fern Library. Retrieved 18 June 2008.
  5. 1 2 3 Earl J. S. Rook (26 February 2004). "Woodsia ilvensis" . Retrieved 19 June 2008.
  6. 1 2 3 4 5 6 7 Phillip Lusby & Jenny Wright (2002). Scottish Wild Plants: Their History, Ecology and Conservation (2nd ed.). Edinburgh: Mercat. pp. 107–109. ISBN   1-84183-011-9.
  7. "From coast to summit - two Woodsia ferns". Royal Botanic Garden Edinburgh . Retrieved 5 June 2008.
  8. "Caithness CWS - Caithness Field Club - Annual Bulletins - 1975 - October - Conservation".
  9. Boughton Cobb (1975). A Handbook of Ferns and their Related Families in the North American Continent Based on Visual Identification. Peterson Field Guides. Houghton Mifflin Harcourt. p. 146. ISBN   0-395-97512-3.