Adiantum viridimontanum Paris

Green Mountain maidenhair fern

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New England Distribution

Adapted from BONAP data

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North America Distribution

Adapted from BONAP data

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Facts About

Green Mountain maidenhair fern is a rare endemic found only in northern Vermont and Maine, and southern Quebec. It inhabits steep cliffs, talus slopes, and thin soils of woodlands and forest edges, on serpentine bedrock. Unlike other globally rare species, its populations appear relatively stable (at least up to 2001). The greatest threats to this species are mining, road building, over-collection, logging and development.

Habitat

Cliffs, balds, or ledges, forest edges, forests, ridges or ledges, talus and rocky slopes

Characteristics

Habitat
terrestrial
New England state
  • Maine
  • Vermont
Show All Characteristics
  • Leaves
    Features of leaves
    the petiole (leaf stalk or stipe) appears to fork into two equal halves
  • Place
    Habitat
    terrestrial
    New England state
    • Maine
    • Vermont
    Specific habitat
    • cliffs, balds, or ledges
    • edges of forests
    • forests
    • ridges or ledges
    • talus or rocky slopes

Wetland Status

Not classified

New England Distribution and Conservation Status

Distribution

Connecticut
absent
Maine
present
Massachusetts
absent
New Hampshire
absent
Rhode Island
absent
Vermont
present

Conservation Status

Exact status definitions can vary from state to state. For details, please check with your state.

Vermont
rare (S-rank: S2), threatened (code: T)

Native to North America?

Yes

Sometimes Confused With

Adiantum aleuticum:
ultimate leaf segments on stalks 0.3-1.3 mm long and false indusial 0.8-2.9 (rarely to 3.4) mm long (vs. A. viridimontanum, with ultimate leaf segments on stalks longer than 0.9 mm and false indusial 2-5 (rarely to 10) mm long).
Adiantum pedatum:
ultimate leaf segments oblong, rounded at the apex, in plane with the blade axis and plants of rich soils (vs. A. viridimontanum, with ultimate leaf segments +/- triangular, acute to obtuse at the apex, often twisted out of plane with the blade axis and plants of serpentine soils).

Family

Pteridaceae

Genus

Adiantum

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Information from Dichotomous Key of Flora Novae Angliae

3.  Adiantum viridimontanum Paris NC

Green Mountain maidenhair fern. ME, VT. Serpentine cliffs and talus, thin soil of woodlands 
and forest edges on serpentine bedrock.