Cystopteris tenuis
(Michx.) Desv.
Upland Brittle Bladderfern
Identity
Unique IDELEMENT_GLOBAL.2.128574
Element CodePPDRY07090
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumFilicinophyta
ClassFilicopsida
OrderPolypodiales
FamilyCystopteridaceae
GenusCystopteris
SynonymsCystopteris fragilis var. mackayiLawsonNephrodium tenueMichx.
Other Common NamesCystoptère grêle (FR) Mackay's Bladder Fern (EN) Mackay's brittle fern (EN) Mackay's Brittle Fern (EN) Mackay's Fragile Fern (EN) upland brittle bladderfern (EN)
Concept ReferenceKartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Taxonomic CommentsThis species is a fertile allotetraploid derived from an ancient cross between C. protusa and an extinct diploid; hybridization involving C. tenuis and other North American Cystopteris species have generated sterile hybrids, including C. × wagneri and C. × illinoensis (FNA 1993, vol. 2). This species is included in a synopsis of the genus (Shmakov et al. 2018), and the generic placement of this taxon, in Cystopteris, is in accordance with the Pteridophyte Phylogeny Group I (2016).
Conservation Status
Rank MethodExpertise without calculation
Review Date2016-05-16
Change Date2010-02-22
Edition Date2010-02-22
Edition AuthorsDavis, G.
Rank ReasonsCystopteris tenuis has a broad range across the northeastern U.S. and into Canada. According to FNA in 1993 Cystopteris tenuis is common in the center of it's range, less so in the north and the west. However, Conservation Data Centers in eastern Canada rank it S4 and S5. Uncommon according to Weakley (2008 draft).
Range Extent CommentsNortheastern to the central U.S. and southern Canada; New Brunswick south and west to southern Minnesota, south through Nebraska and Kansas to Oklahoma, Arkanas, Tennessee, and South Carolina in the mountains; outlying reports/occurrences in western South Dakota, Colorado, Nevada, Utah, Arizona, New Mexico, central Ontario and Quebec (FNA 1993, Kartesz draft 2009).
Threat Impact CommentsThreatened by land-use conversion, habitat fragmentation, and forest management practices (Southern Appalachian Species Viability Project 2002).
Other Nations (2)
United StatesN4
| Province | Rank | Native |
|---|
| Iowa | SNR | Yes |
| Arizona | SNR | Yes |
| North Carolina | S1 | Yes |
| Colorado | S2 | Yes |
| Tennessee | S1 | Yes |
| Nebraska | S2 | Yes |
| Indiana | SNR | Yes |
| Virginia | S4 | Yes |
| Pennsylvania | SNR | Yes |
| New Hampshire | SNR | Yes |
| Nevada | S1 | Yes |
| Wisconsin | SNR | Yes |
| Michigan | SNR | Yes |
| Oklahoma | SNR | Yes |
| Kentucky | S2 | Yes |
| New Jersey | S4 | Yes |
| Rhode Island | SNR | Yes |
| Illinois | SNR | Yes |
| Vermont | S5 | Yes |
| Minnesota | SNR | Yes |
| Ohio | SNR | Yes |
| South Dakota | SNR | Yes |
| Massachusetts | SNR | Yes |
| Maryland | SNR | Yes |
| Missouri | S1 | Yes |
| Delaware | S1 | Yes |
| New York | S4 | Yes |
| District of Columbia | SNR | Yes |
| Utah | SNR | Yes |
| Maine | SNR | Yes |
| New Mexico | SNR | Yes |
| Kansas | S1 | Yes |
| Connecticut | SNR | Yes |
| Arkansas | SNR | Yes |
| South Carolina | SU | Yes |
| West Virginia | S4 | Yes |
CanadaN4
| Province | Rank | Native |
|---|
| Nova Scotia | S4 | Yes |
| Ontario | S4 | Yes |
| Prince Edward Island | S1 | Yes |
| New Brunswick | S4 | Yes |
| Manitoba | S3 | Yes |
| Quebec | S3 | Yes |
Roadless Areas (4)
Vermont (1)
| Area | Forest | Acres |
|---|
| Devil's Den 09083 | Green Mountain and Finger Lakes National Forests | 9,169 |
References (7)
- Flora of North America Editorial Committee (FNA). 1993a. Flora of North America north of Mexico. Vol. 2. Pteridophytes and gymnosperms. Oxford Univ. Press, New York. xvi + 475 pp.
- Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
- Kartesz, J.T. 2009. Floristic Synthesis of North America. Biota of North America (BONAP). (in press).
- Pteridophyte Phylogeny Group I. 2016. A Community-Derived Classification for Extant Lycophytes and Ferns. Journal of Systematics and Evolution 54(6): 563–603.
- Shmakov, A.I., Batkin, A.A., and A.V. Vaganov. 2018. Synopsis of the genus <i>Cystopteris</i> Bernh. (Cystopteridaceae). Ukrainian Journal of Ecology 8(4): 290-297.
- Southern Appalachian Species Viability Project. 2002. A partnership between the U.S. Forest Service-Region 8, Natural Heritage Programs in the Southeast, NatureServe, and independent scientists to develop and review data on 1300+ regionally and locally rare species in the Southern Appalachian and Alabama region. Database (Access 97) provided to the U.S. Forest Service by NatureServe, Durham, North Carolina.
- Weakley, A.S., and Southeastern Flora Team. 2024. Flora of the southeastern United States. Edition of March 4, 2024. University of North Carolina Herbarium (NCU), North Carolina Botanical Garden, University of North Carolina, Chapel Hill. 2203 pp.