Phaeographis dendritica  (Ach.) Müll. Arg.

    Thallus crustose, 2-4 cm across, thin, most often smooth and glossy, whitish, sometimes tinged yellowish or greenish. Apothecia lirellate, scattered all over the thallus, 1-3 x 0.3-0.5 mm, flat and at the same level as the thallus, wide, ends usually acute, seldom simple, straight or sickle or scimitar-shaped, most often feather bunch-like, dendritic or stellate, black, covered with white pruine; in perpendicular section true exciple black, continous below the hymenium. Ascospores, narrowly fusiform, brown, 5-9-septate, 30-40 x 6-9 µm. C-, K+ yellow > blood red, Pd+ golden yellow. Common, oceanic trends, ubiquitous on bark of deciduous trees. See Phaeographis smithii of which lirella are shorter and more immersed, ascospores 5-7-septate and above all, lirellae section shows a discontinuous exciple below. This species is sometimes parasited by Melaspilea lentiginosa that induces apothecia abortion.*