- COSEWIC – Special concern.
- COSSARO – Special concern.
- Attractive fern with delicate, triangular-shaped fronds which can grow to a height of 50 cm or more.
- Leaflet stems are not always opposite. The underside of the frond is faintly downy; short, scaly hairs can sometimes be found on the veins.
- Has a creeping, scaly, slightly pulpy root.
- Fronds appear towards the end of May.
- One known site in Muskoka – it prefers to grow in rich, moderately acidic soils, in deciduous forest such as Maple-Beech forests, where the soil is moist or wet.
- Northern limit of range.
- Logging operations and the mechanization of maple sugar operations can have negative effects.