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Cystopteris tenuis (Michaux) Desvaux. Common name: Mackay's Fragile Fern, Mackay's Bladder Fern. Phenology: May-Aug. Habitat: Moist outcrops and cliffs of metamorphic and sedimentary rocks, occasionally in moist soils near rock outcrops or moist soil banks. Distribution: NL (Newfoundland) west to MN and NE, south to VA, IL, MO, and AR (Peck 2011), and in the mountains to NC, TN, and n. GA.

Origin/Endemic status: Native

Taxonomy Comments: This species has been interpreted as a fertile allotetraploid derived from hybridization between C. protrusa and an extinct or currently undiscovered second parent (C. "hemifragilis"), with its genome symbolized HHPP (Paler & Barrington 1995).

Synonymy ⓘ: = Ar, Can, FNA2, Il, K4, Mo1, NE, NS, NY, Pa, POWO, Tn, Va, W, Shmakov, Batkin, & Vaganov (2018); Nephrodium tenue Michx.; = Cystopteris fragilis (L.) Bernh. var. mackayi G.Lawson — C, F, G; = Cystopteris fragilis (L.) Bernh. var. mackayii G.Lawson — Tat, orthographic variant; = n/a — RAB; < Cystopteris fragilis (L.) Bernh. — WV; < Filix fragilis (L.) Underw. — S13. Basionym: Nephrodium tenue Michx. 1803

Links to other floras: = Cystopteris tenuis - FNA2

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: FACU (name change)
  • Eastern Mountains and Piedmont: FACU (taxonomic split from wetland indicator species)
  • Great Plains: FACU (taxonomic split from wetland indicator species)
  • Midwest: FACU (taxonomic split from wetland indicator species)
  • Northcentral & Northeast: FACU (taxonomic split from wetland indicator species)

Heliophily ⓘ: 3

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image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷

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Horticultural Information

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