# Mountain Spleenwort (*asplenium montanum*)

The Mountain Spleenwort (Asplenium montanum) is a resilient, petite evergreen fern that makes its home in the rugged, acidic rock crevices of the Appalachian region. Clinging tenaciously to sheer sandstone cliffs and shaded ledges, this delicate pteridophyte is a classic lithophyte. Despite its fragile appearance, it is remarkably adapted to survive in nutrient-poor, rocky crevices where few other plants can establish a foothold. This fern is highly regarded by botanists as a key element of cliff-face ecosystems. It often hybridizes with other spleenworts, contributing to a complex evolutionary web of ferns in eastern North America. Its presence is an indicator of pristine, stable microclimates within mountainous forests, making it a delightful find for hikers and botanical enthusiasts alike.

- **Category:** [Plants](https://www.snappit.app/explore/categories/plant)
- **Rarity:** Common
- **Danger:** 1/5 · Very low
- **Snaps:** 1
- **Habitat:** Found in damp, shaded, highly acidic rock crevices and sandstone cliff faces within mountainous forests.

![Mountain Spleenwort](https://inaturalist-open-data.s3.amazonaws.com/photos/167526/medium.jpg)

Photo: Ken-ichi Ueda, CC BY 4.0 · [iNaturalist](https://www.inaturalist.org/photos/167526)

## Appearance

Mountain Spleenwort is a small, tufted fern with bluish-green, triangular to lance-shaped fronds that measure between 5 and 20 centimeters in length. The leaves are deeply divided, giving them a delicate, feathery texture with wedge-shaped segments. A key identification feature is the petiole, which is dark reddish-brown at the very base but transitions into a bright green color as it ascends towards the leafy blade. Its undersides bear linear, brown spore-producing structures called sori arranged in a herring-bone pattern along the veins, which are covered by a thin, pale membrane called an indusium when young.

## Taxonomy

- **Kingdom:** Plantae
- **Phylum:** Tracheophyta
- **Class:** Polypodiopsida
- **Order:** Polypodiales
- **Family:** Aspleniaceae
- **Genus:** Asplenium

## Interesting facts

- Mountain Spleenwort is an evolutionary parent to several other hybrid fern species through chromosome doubling, acting as a crucial genetic building block in the Appalachian spleenwort complex.
- The common name 'spleenwort' originates from the ancient 'Doctrine of Signatures', which suggested that the spleen-shaped sori on the backs of the fronds could cure ailments of the spleen.
- Unlike many ferns that require rich, organic soil, this species is a strict lithophyte, meaning it grows directly on rocks and survives off minimal windblown dust and decomposing organic matter.

## Special abilities

- **Acid Rock Lithophytism:** It selectively grows in highly acidic, nutrient-deficient rock fissures, utilizing specialized roots to anchor itself and absorb trace minerals.
- **Desiccation Tolerance:** Can withstand periods of low moisture by curling its fronds to reduce water loss, recovering quickly when humidity returns.
- **Hybridization Potential:** Readily hybridizes with other spleenwort species to produce unique, sterile or fertile hybrid offspring.

## Measurements & details

- **Length:** 5-20 cm
- **Lifespan:** 5-15 years

## Diet & Feeding

As a photoautotrophic plant, it produces its own food through photosynthesis using sunlight, carbon dioxide, water, and essential minerals absorbed from rock crevices.

- **Primary Foods:** Sunlight, Carbon dioxide, Water, Dissolved rock minerals

## Ecological connections

- **Hybridizes with:** [Ebony Spleenwort](https://www.snappit.app/explore/ebony-spleenwort) (*Asplenium platyneuron*) — Hybridizes with this species to produce the sterile or fertile allotetraploid hybrids like Lobed Spleenwort.
- **Competitor:** Sword Moss (*Bryoxiphium norvegicum*) — Competes for space and moisture within narrow, humid sandstone crevices in cliff ecosystems.

## Safety

**Danger:** 1/5 · Very low

No special safety notes yet.

## Frequently Asked Questions

### How to identify Mountain Spleenwort?

Compare frond shape, how the leaflets are arranged, the stalk, and any spore clusters you can see. A single detached leaflet often hides the plant's overall growth pattern. Fern Identifier: upload a photo and compare the visible details.

### How long is Mountain Spleenwort?

5-20 cm

### How long does Mountain Spleenwort live?

5-15 years

### What does Mountain Spleenwort eat?

As a photoautotrophic plant, it produces its own food through photosynthesis using sunlight, carbon dioxide, water, and essential minerals absorbed from rock crevices.

### Where is Mountain Spleenwort usually found?

Found in damp, shaded, highly acidic rock crevices and sandstone cliff faces within mountainous forests.

## Where to spot

- [Hedgesville Historic District](https://www.snappit.app/guides/places/hedgesville-historic-district) — West Virginia, US · Historic District
- [Holtwood Environmental Preserve](https://www.snappit.app/guides/places/holtwood-environmental-preserve) — Pennsylvania, US · Nature Reserve
- [Rugby](https://www.snappit.app/guides/places/rugby) — Tennessee, US · Neighborhood

[View all places to see Mountain Spleenwort](https://www.snappit.app/guides/where-to-see/mountain-spleenwort)

## More Plants

- [white snakeroot](https://www.snappit.app/explore/white-snakeroot) (*Ageratina altissima*)
- [tree-of-heaven](https://www.snappit.app/explore/tree-of-heaven) (*Ailanthus altissima*)
- [western sword fern](https://www.snappit.app/explore/western-sword-fern) (*Polystichum munitum*)
- [common milkweed](https://www.snappit.app/explore/common-milkweed) (*Asclepias syriaca*)

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Source: [Mountain Spleenwort: Facts & Places to See — Snappit](https://www.snappit.app/explore/mountain-spleenwort)