Overview

Distribution

National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Global Range: Scandinavia, Europe, Russia, North America. In North America, Alaska to California, east to Montana.

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Ecology

Habitat

Comments: On bark of twigs and branches of deciduous trees and shrubs, in open to sheltered forests and orchards. Not closely associated with old growth forest.

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G3 - Vulnerable

Reasons: Total estimate number of individuals is 3,000-10,000 Total estimated size of habitat is 10,000-50,000 acres. Broad circumboreal range. Populations and habitats likely stable, given varity of forest age classes in various parts of range. Probably many protected locations. Presumable not very threatened worldwide, given varity of forest age classes in variious parts of range. Old orchards are disappearing in face of development. Individual plants are fragile, but are tiny and occur in masses on twigs and branches that are not easily damaged except by catastrophic damage. Small size, hard to find, undoubtedly undercollected rangewide.

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Global Short Term Trend: Relatively stable (=10% change)

Comments: Populations and habitats likely stable, given the variety of forest age classes in various parts of range.

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Threats

Comments: Presumably not very threatened worldwide, given variety of forest age classes in various parts of range. Old orchards are disappearing in face of development.

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