General:
Common Name: The Loop Lichens. Describes the conspicuously rounded axils of the lobes.
Small to medium stratified foliose lichens, corticate above and below, sorediate (in BC), lobes loosely appressed to loosely attached, short to elongate, averaging to (0.7–) 1–5 mm wide, thin. Upper surface greenish or greyish, somewhat shiny. Lower surface black, shiny, bearing forked rhizines. Medulla white. Photobiont green.
Apothecia unknown in B.C. material.
Over bark and rock.
Notes: Hypotrachyna is primarily a tropical genus consisting of about 80 species worldwide. Twenty-three of these occur in North America, though only two species are known in B.C.

Species description:
Upper surface greyish, bluish or if somewhat greenish, then not yellowish green; lobes proportionately rather short and broad; cilia sometimes present at margins AND
Soralia broad, diffuse, loosely packed with soredia; cilia absent or very sparse, less than 1 mm long; rhizines progressively better developed toward thallus centre; medulla C+ reddish

Reactions:
Cortex K+ yellow; medulla C+ reddish, KC+ reddish.

Contents:
Atranorin and gyrophoric acid.

Source:  Lichens of British Columbia

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration By:  Trevor Goward

Synonyms and Alternate Names:
Parmelia revoluta Flörke