Physematium scopulinum Trevis.

Rhizome and Frond Type

Physematium scopulinum grows from a short, scaly rhizome, and produces twice pinnate fronds.

Frond Size and Color

Most of these fronds grow upright, reaching 10 to 30 cm long and up to 8 cm wide, with a medium to pale green color.

Pinnae and Rachis Hair Characteristics

The pinnae and rachis are sparsely to moderately covered with sharply protruding long hairs that do not lie flat against the stem; some of these hairs have a globular gland at their tip.

Species Distinguishing Feature

This hairy rachis is the feature that distinguishes Physematium scopulinum from the similar species Physematium oreganum.

Rachis Surface Structure

The upper, adaxial side of the rachis is grooved.

Sori and Indusium Features

Small round sori grow on the underside of the pinnae, and are initially partly covered by a narrowly lobed indusium.

Leaf Development Pattern

New leaves of this fern develop with circinate vernation, meaning they emerge tightly curled.

North American Distribution Range

Physematium scopulinum is widespread in mountain areas near the west coast of North America, ranging from southern Alaska to southern California, and also grows in the Rocky Mountains from British Columbia to Colorado.

Isolated Population Locations

Isolated populations of this species also occur in northeastern North America.

Habitat Preferences

It is most commonly found in sunny rocky habitats, including rock crevices, talus slopes, and rock ledges.