Ropalospora viridis (Tonsberg) Tonsberg

    Thallus smooth to minutely granular or areolate, areoles convex, grey-greenish, grey-glaucous when dry, greenish when moist, prothallus paler, soon covered from the center with soralia, rounded to oval, green, green-yellowish when moist, grey-green when dry, containing small granular soredia, finally crust-forming, cracked, except at thallus margins, constantly smooth. Apothecia rare, 0.2-0.4 mm diam., disc flat, black, exciple persistent, brown-black. Ascospores clavate, one tip narrow, sometimes curve, 5-6-septate, 22-40 x 2-2.5 µm. Photobiont: Trebouxioid. C-, K-, KC-, Pd-, UV+ white. On bark of deciduous trees in humid woodlands. Not to be confused with sorediate morphotypes of Fuscidea lightfootii of which the thallus is smaller and less cracked, with different ascospores on fertile morphs.*