| Cystopteris fragilis | |
|---|---|
| |
| Sori | |
| Conservation status | |
 Secure (NatureServe) | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Division: | Polypodiophyta |
| Class: | Polypodiopsida |
| Order: | Polypodiales |
| Suborder: | Aspleniineae |
| Family: | Cystopteridaceae |
| Genus: | Cystopteris |
| Species: | C. fragilis |
| Binomial name | |
| Cystopteris fragilis (L.) Bernh. | |
| Synonyms | |
|
Filix fragilis (L.) Underw. | |
Cystopteris fragilis is a species of perennial fern known by the common names brittle bladder-fern and common fragile fern. It can be found worldwide, generally in shady, moist areas.
Description
It has a short, black rootstock. The leaves are up to 5-25 cm and are borne on fleshy petioles with few or no long hairs. The petioles are about half the length of the leaf blade. Each leaf is divided into many pairs of leaflets, each of which is subdivided into lobed segments. The leaflets are narrowly triangular and apiculate. The underside of the leaf has many rounded sori containing the sporangia. A young Cystopteris fragilis is said to have the scent of bitter almond, which is caused by spores that contain hydrogen cyanide.
Habitat
The plant, native to for example Finland, grows in places fit for its brittle structure: usually shady and slightly moist areas, in the cracks and ledges of vertical rock faces, blockfields and sometimes on even cliff surfaces as well. It avoids the more most acidic and barren cliffs and prefers especially slightly lime rich soil.
Gallery
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Icicle Creek, WA
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Adaxial leaf
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Abaxial leaf
References
- BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
- ^ Piirainen, Mikko; Piirainen, Pirkko; Vainio, Hannele (1999). Kotimaan luonnonkasvit [Native wild plants] (in Finnish). Porvoo, Finland: WSOY. p. 36. ISBN 951-0-23001-4.
External links
- Jepson Manual Treatment: Cystopteris fragilis
- USDA Plants Profile: Cystopteris fragilis
- Flora of North America: Cystopteris fragilis
- Cystopteris fragilis — U.C. Photo gallery
| Taxon identifiers | |
|---|---|
| Cystopteris fragilis |
|
| Polypodium fragile | |
 | This Polypodiales-related article is a stub. You can help Misplaced Pages by expanding it. |
- NatureServe secure species
- Cystopteris
- Ferns of Asia
- Ferns of Europe
- Ferns of the Americas
- Ferns of Canada
- Ferns of the United States
- Ferns of California
- Flora of England
- Flora of Finland
- Flora of Lebanon
- Flora of Russia
- Flora of the Sierra Nevada (United States)
- Flora of South Georgia Island
- Biota of South Georgia and the South Sandwich Islands
- Plants described in 1805
- Polypodiales stubs