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General:
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 isidiate (or apparently isidiate), isidia coarsely granular, often branchedcoralloid at maturity or, in extreme cases, lobulate; upper surface often dark brown AND
Lobes averaging to more than 0.8 mm wide; isidia occasionally bearing minute, erect hairs; rhizines generally distinctly protruding beyond lobe tips; over bark or mossy rock
Reactions:
All spot tests negative.
Contents:
No lichen substances reported.
Source: Lichens of British Columbia |
