Hyperphyscia adglutinata (Flörke) H. Mayrhofer & Poelt

    Thallus foliose, small, 1-2 cm across, ofter larger by confluence of several conspecific colonies, made of narrow lobes, 0.2-0.5 mm wide, fan-shaped, apices palmate, thick, very tightly appressed to the substratum, upper surface brown-greyish when dry, grey-greenish to brown-greenish when moist, more or less covered with crater-shaped soralia, 0.1-0.3 mm diam., laminar but potentially able to cover the whole center, concolorous or pale grey-green, lower surface whitish towards the margin, darker in the center with few rhizines. Apothecia rare (but more and more frequent due to global warming), sessile, 0.5-1 mm diam., disc blackish, exciple thick, smooth, whitish. Ascospores grey-brown, often immature, elliptical, 1-septate, 13-20 x 7-9 µm, according to literature; 13-17 x 7-9 µm according to our measurements. Photobiont: Trebouxia. Chemical spot tests negative. Rare (or understated) in our propection area, thermophile trends, on dusty bark of trees, often at the base of trunks. A minute foliicolous form is found on box tree leaves (Hyperphyscia adglutinata foliicolous form).  See Phaeophyscia orbicularis of which the lobes are less appressed, and with abundant rhizines and dark grey soralia. See also Parmeliopsis hyperopta that is K+ yellow.