Pseudevernia furfuracea (L.) Zopf. var. furfuracea
Thallus tufted, erect or pendent, 5-15 cm across, lobes strap-shaped, branched, caniculate (gutter-shaped), 2-6 mm wide, structures of upper and lower surfaces different, upper surface smooth to furfuraceous (covered with scaly branlike particles), pale greyish, pale grey with violet tinge, (var. furfuracea is more grey-greenish and var. ceratea more grey-whitish, especially the saxicolous form Pseudevernia furfuracea var. ceratea saxicolous form), more or less covered (mainly towards the base where they are more developed) with cylindrical isidia, 1-5 mm tall, grey-greenish suggesting a hirsute matt; lower surface whitish, white-pink when young turning pink brown-ochre, brownish and even blackish when old. Apothecia very rare (found mainly in montane specimen), bowl or cup-shaped at the apex of a short stipe, disc concave, brownish, brown-greenish, margins wrinkled. Ascospores colourless, ellipsoid, simple, , 7-10 x 4-5 µm. Photobiont: Trebouxioid. Two chemotypes are known:
Pseudevernia furfuracea var. furfuracea: cortex : K+ yellow, medulla : C-, KC+ very pale red or KC-, Pd-. This variety usually is grey-greenish, notably when moist. Sometimes fertile.
Pseudevernia furfuracea var. ceratea (Ach.) D. Hawksw.: cortex : K+ yellow, medulla : C+ bright pink, KC+ red, Pd-. Usually grey-whitish. In our prospection area, fertile specimen have not been observed.
Montane, observed in our prospection area only in the Monts d'Arrée on trees, wod poles and less frequently on rocky ridges (Pseudevernia furfuracea var. ceratea).
Montane trends. In our prospection area, may be found only in the Monts d'Arrée on trees, wood poles and sometimes on rocks of exposed ridges.*