Punctelia jeckeri (Roum.) Kalb.

    Thallus foliose, rosette-forming, to 3-6 cm diam., lobes 3-7 mm wide, pleated towards the center, lobe apices rounded, sometimes turned up, pruinose, brown-greyish to brownish, occasionally with folioles; upper surface grey-greenish when moist, brown-greyish to brownish when dry or when young, pseudocyphella present, from where arise soralia, mainly marginal, ascending and bearing farinose soredia; lower surface whitish to pale brown with rhizines towards the center. Apothecia unknown in our prospection area but if present in cup with a sorediate margin. Photobiont: Trebouxioid. Cortex : K+ yellow ; medulla : C+ red, K-, KC+ red, Pd-, UV-. On mossy barks of deciduous trees in well-lit areas. Very similar to Punctelia subrudecta and sometimes growing together, but differs from the latter by its habitat restricted to barks, its colour, green-greyish and the lobe aspect: pruinose with brown margin.*