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Home/Species/ Jordan's Maidenhair Fern

Adiantum jordanii

C. Muell.

Jordan's Maidenhair Fern

G4Apparently Secure (G4G5) Found in 52 roadless areas NatureServe Explorer →
G4Apparently SecureGlobal Rank
Medium - lowThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.135723
Element CodePPADI03060
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumFilicinophyta
ClassFilicopsida
OrderFilicales
FamilyPteridaceae
GenusAdiantum
Other Common Names
California maidenhair (EN) California Maidenhair (EN)
Concept Reference
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.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2023-08-11
Change Date1990-01-16
Edition Date2023-08-11
Edition AuthorsBroaddus, Lynn (1991), rev. C. Nordman (2023).
Threat ImpactMedium - low
Range Extent200,000-2,500,000 square km (about 80,000-1,000,000 square miles)
Number of Occurrences> 300
Rank Reasons
Jordan's Maidenhair Fern occurs in the western United States and northwestern Mexico, in the Coast Range and Sierra Nevada from southwestern Oregon to the mountains of southern California and northern Baja California. There are about 2000 occurrences documented from 1992 to 2023, but some occurrences are just a few plants. It is likely threatened by recreation impacts, such as from rock climbing and ORVs, and impacts from long-term or extreme drought, such as may be exacerbated by climate change. It occurs on many protected conservation lands in California.
Range Extent Comments
Jordan's Maidenhair Fern occurs in the western United States, and Baja California in northwestern Mexico. It occurs in the Coast Range and Sierra Nevada from southwestern Oregon to the mountains of southern California and northern Baja California. The range extent was estimated to be about 300,000 square kilometers, using herbarium specimens and photo-based observations documented between 1992 and 2023 (CCH2 Portal 2023, Flora of North America Editorial Committee 1993, GBIF 2023, iNaturalist 2023).
Occurrences Comments
Based on herbarium records and photo-based observations of Jordan's Maidenhair Fern documented between 1992 and 2023, there are about 2000 occurrences rangewide (CCH2 Portal 2023, GBIF 2023, iNaturalist 2023).
Threat Impact Comments
Threats to Jordan's Maidenhair Fern likely include recreation impacts, such as from rock climbing and ORVs, and impacts from long-term or extreme drought, such as may be exacerbated by climate change.
Ecology & Habitat

Habitat

This species is found in canyons and ravines with rocky banks where it is shady and seasonally moist, on cliffs, in oak woodlands, and chaparral at elevations up to 1000 meters (CCH2 Portal 2023, Flora of North America Editorial Committee 1993).
Terrestrial Habitats
Woodland - HardwoodShrubland/chaparralBarrensBare rock/talus/screeCliff
Other Nations (1)
United StatesN4
ProvinceRankNative
OregonS2Yes
CaliforniaSNRYes
Rhode IslandSNANo
Threat Assessments
ThreatScopeSeverityTiming
6 - Human intrusions & disturbanceSmall (1-10%)Moderate or 11-30% pop. declineHigh (continuing)
6.1 - Recreational activitiesSmall (1-10%)Moderate or 11-30% pop. declineHigh (continuing)
11 - Climate change & severe weatherLarge - restrictedModerate or 11-30% pop. declineHigh (continuing)
11.2 - DroughtsLarge - restrictedModerate or 11-30% pop. declineHigh (continuing)

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Plant Characteristics
DurationPERENNIAL
Economic Value (Genus)Yes
Roadless Areas (52)
California (50)
AreaForestAcres
Arroyo SecoAngeles National Forest4,703
Bald RockPlumas National Forest4,675
Bear MountainLos Padres National Forest913
Bell QuinbyShasta-Trinity National Forest11,556
Black ButteLos Padres National Forest5,116
Black MountainLos Padres National Forest16,818
CamuesaLos Padres National Forest8,209
ColdwaterCleveland National Forest8,402
Cow CreekShasta-Trinity National Forest22,627
Cow CreekSix Rivers National Forest1,271
Cucamonga CSan Bernardino National Forest4,106
De La GuerraLos Padres National Forest5,418
Devil GulchSierra National Forest30,490
DiableLos Padres National Forest19,597
Dry LakesLos Padres National Forest17,043
Eagle PeakCleveland National Forest6,481
Ferguson RidgeSierra National Forest6,104
Garcia MountainLos Padres National Forest7,850
GrindstoneMendocino National Forest26,031
Horseshoe SpringsLos Padres National Forest14,089
IshiLassen National Forest21,805
La BreaLos Padres National Forest14,031
La PanzaLos Padres National Forest4,954
LaddCleveland National Forest5,300
Little French CShasta-Trinity National Forest11,529
Lpoor CanyonLos Padres National Forest13,762
Machesna MountainLos Padres National Forest12,271
Malduce BuckhornLos Padres National Forest14,177
ManzanaLos Padres National Forest2,101
MatilijaLos Padres National Forest5,218
MonoLos Padres National Forest28,141
NordhoffLos Padres National Forest12,031
North Fork Middle Fork American RiverTahoe National Forest11,245
Orleans Mtn. CSix Rivers National Forest15,589
PantherShasta-Trinity National Forest12,016
Pine CreekCleveland National Forest503
RinconSequoia National Forest54,610
Salt CreekAngeles National Forest11,022
Santa CruzLos Padres National Forest21,182
Sespe - FrazierLos Padres National Forest106,910
Strawberry PeakAngeles National Forest7,245
Tepusquet PeakLos Padres National Forest5,821
TequepisLos Padres National Forest9,080
Thomes CreekMendocino National Forest16,616
TrabucoCleveland National Forest23,341
Trumbull PeakStanislaus National Forest6,164
UnderwoodSix Rivers National Forest6,591
WestforkAngeles National Forest4,407
White LedgeLos Padres National Forest18,632
WildhorseCleveland National Forest1,483
Oregon (2)
AreaForestAcres
North KalmiopsisSiskiyou National Forests91,560
Shasta CostaSiskiyou National Forests14,420
References (5)
  1. CCH2 Portal. 2023. Consortium of California Herbaria. Online. Available: https//:www.cch2.org/portal/index.php (accessed 2023).
  2. 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.
  3. Global Biodiversity Information Facility (GBIF). 2023. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2023).
  4. iNaturalist. 2023. Online. Available: https://www.inaturalist.org (accessed 2023).
  5. 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.