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Cystopteris Bernhardi. Bladder Fern, Brittle Fern.

Key to Cystopteris

A genus of about 30-35 species, sub-cosmopolitan in distribution, primarily of temperate regions but also in montane to alpine settings in tropical regions.

ID notes: See Woodsia for suggestions on distinguishing between Cystopteris and Woodsia, somewhat similar ferns often confused.

Key advice:Hybrids frequently occur where two or more species of Cystopteris grow in proximity. The following hybrids may be anticipated in our area: Cystopteris bulbifera × tennesseensis, Cystopteris bulbifera × tenuis [= C. ×illinoensis R.C. Moran], Cystopteris fragilis × tenuis, Cystopteris protrusa × tennesseensis, Cystopteris protrusa × tenuis, Cystopteris tennesseensis × tenuis [= C. ×wagneri R.C. Moran].

Ref: Ekrt et al. (2022); Haufler, Moran, & Windham (1993) In Flora of North America Editorial Committee (1993b); Haufler, Windham, & Ranker (1990); Kramer & Green (1990); Rothfels et al. (2014); Shmakov, Batkin, & Vaganov (2018); Wang & Haufler in FoC (2013); Windham & Pryer (2022). Show full citations.

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Hover over a shape, letter, icon, or arrow on the map for definition or see the legend. Data for arrows not developed for genera and families which may have species only occurring outside the flora area.

image of plant© Erik Danielson | Cystopteris bulbifera source | Original Image ⭷
image of plant© Gary P. Fleming | Cystopteris tenuis | Original Image ⭷
image of plant© Bruce A. Sorrie | Cystopteris protrusa | Original Image ⭷
image of plant© Gary P. Fleming | Cystopteris bulbifera | Original Image ⭷

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