Cystopteris protrusa
| Cystopteris protrusa | |
|---|---|
| File:Cystopteris protrusa-fronds.png | |
| Cystopteris protrusa fronds | |
| Scientific classification Edit this classification | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Division: | Polypodiophyta |
| Class: | Polypodiopsida |
| Order: | Polypodiales |
| Suborder: | Aspleniineae |
| Family: | Cystopteridaceae |
| Genus: | Cystopteris |
| Species: | C. protrusa
|
| Binomial name | |
| Cystopteris protrusa | |
Cystopteris protrusa is a common fern of North America, commonly known as the lowland bladderfern, lowland brittle fern or lowland fragile fern.[2]
The plant is native to eastern Canada, and the Midwestern and Eastern United States. Throughout much of its range it is the most common Cystopteris fern species.[3][4]
Description
[edit | edit source]Unlike most species of the genus Cystopteris, this fern is exclusively terrestrial, often forming large, dense colonies. It is also largely a spring ephemeral. Some fronds may remain by late summer, but most have disappeared.[5]
The specific name, protrusa, refers to the fact that the rhizome protrudes a short distance beyond the current year's fronds to form the following year's leaf buds. This protrusion is a positive diagnostic in the field. Sori are round and covered in a bladder-like indusium.[6]
Taxonomy
[edit | edit source]Cystopteris protrusa was originally considered only a variety of Cystopteris fragilis.[7] However, it is now known that this is a diploid species, while C. fragilis (ss) is a polyploid species of hybrid origin. C. protrusa is a parent of the hybrid species Cystopteris tennesseensis and Cystopteris tenuis.[8]
See also
[edit | edit source]References
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External links
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