Heterodermia speciosa (Wulf.) Trevisan
Heterodermia obscurata p.p.
Heterodermia japonica p.p.
Thallus shaped as a rosette of 2-4 cm diam., formed by radiant and quite notched lobes, 1-2 mm wide, upper side cream, pale cream-ochre when dry, glaucous to grey-greenish when wet, well applied on substratum, with soralia apical and labriform, whitish to pale grey-bluish, a bit floury ; lower side cream and slightly brownish with simple rhizines at margins, black. Non fertile under our climates, elsewhere with some rare apothecia with a dark brown disc and a more light and crenelated exciple. Ascospores ellipsoid, brown, 1-septate, 20-30 x 12-18 µm according to literature. Cortex and medulla C-, K+ yellow, KC+ yellow. Rare species of Lobarion pulmonariae growing on mossy trunks on tree in wet temperate oceanic forests. Cf. Heterodermia obscurata of which the lower side of thallus is colored ochre-orange (at least partially) and Heterodermia subneglecta, lighter and from exposed coastal heaths.