E-Flora BC: Electronic Atlas of the Flora of British Columbia

Phaeophyscia adiastola (Essl.) Essl.
Granulating shadow

Introduction to the Lichens

© Curtis Bjork  Email the photographer   (Photo ID #24271)

E-Flora BC Static Map
Distribution of Phaeophyscia adiastola
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Consortium of North American Lichen Herbaria map

Species Information

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Illustration By: Trevor Goward

Common Name: The Shadow Lichens. Alludes to the dark colour of the upper surface of most species. Small to medium stratified foliose lichens, corticate above and below, isidiate or sorediate or not, lobes closely appressed to semi-erect, elongate-linear to elongate (rarely short), averaging to 0.2–1.5 (–3) mm wide, thin. Upper surface usually brownish, K- (atranorin absent), dull, lacking pruina and white-spotting. Lower surface dark brown to black, occasionally pale, bearing scattered, short, simple rhizines. Medulla white (ours). Photobiont green.
Apothecia located over upper surface, averaging to 1–2.5 mm across, rim occasionally bearing short colourless hairs, disc dark; spores 2-celled, ellipsoid to spindle-shaped, brown, 8 per ascus.
Over rock, bark, moss and other substrates.
Notes: Of the 19 species of Phaeophyscia reported for North America, ten are known to occur in B.C. Phaeophyscia was formerly treated within Physcia.
Species description:
Lobes averaging to less than 1.5 mm wide; upper surface convex to rarely concave at lobe tips; rhizines projecting or not; distribution and status various AND
Thallus sorediate and/or isidiate (check lower surface of lobe margins); apothecia generally absent AND
Thallus distinctly sorediate, soredia usually finely granular, never coralloid-branched; upper surface pale or brownish, never dark brown AND
Soralia variously distributed, but usually in part well developed over upper surface (including along lobe margins); rhizines often distinctly projecting past lobe tips; widespread; common AND
Soralia coarsely granular, located mostly over (upper surface of) lobe tips and along lobe margins; rare, in B.C. known only in eastern intermontane localities
All spot tests negative.
No lichen substances reported.

Source: Lichens of British Columbia

Habitat / Range

Habitat: Rare over mossy base-rich rocks and deciduous trees and shrubs in intermontane regions at lower elevations
World Distribution: western N Am – eastern N Am, N to BC, S to AZ.

Source: Lichens of British Columbia

Synonyms and Alternate Names

Physcia adiastola Essl.

Taxonomic and Nomenclatural Links

Additional Range and Status Information Links

Additional Photo Sources

General References