Distribution: N - VG, Frl, Ven (Lazzarin 2000b), Piem, Emil (Fariselli & al. 2020), Lig. C - Tosc, Marc (Nimis & Tretiach 1999), Laz, Sar. S - Camp (Aprile & al. 2003b), Bas, Pugl, Cal (Puntillo 1996), Si.
Description: Thallus crustose, areolate, white to grey-white, sometimes delimited by a black prothallus. Upper cortex pseudoparenchymatous, with minute crystals not soluble in K; medulla white, I-. Apothecia lecideine, 0.2-0.3 mm wide, immersed at first, then emergent, adnate, without a spurious thalline margin; disc black sometimes white-pruinose, first flat then convex; proper margin thin, finally excluded. Epithecium brown; hymenium colourless, I+ blue; paraphyses simple with enlarged, pigmented apical cells. Asci 8-spored, with a thick apex, amyloid, with a distinct axial mass, Bacidia-type. Ascospores 3-septate, brown, with rounded lumina, very thick-walled, not ornamented, often curved, 13-18 x 8-11 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a mild-temperate lichen found on isolated trees with eutrophic or eutrophicated bark, usually at relatively low elevations. The relationship with D. alboatrum needs to be clarified.
The Trustees of the Natural History Museum, London – CC BY-SA 4.0 Source: http://data.nhm.ac.uk/dataset/56e711e6-c847-4f99-915a-6894bb5c5dea/resource/05ff2255-c38a-40c9-b657-4ccb55ab2feb?view_id=6ba121d1-da26-4ee1-81fa-7da11e68f68e&filters=subDepartment%3ALichens%7CgbifIssue%3ATAXON_MATCH_HIGHERRANK%7Cfamily%3Acaliciaceae