Myriolecis invadens (H. Magn.) Sliwa, Zhao Xin & Lumbsch
Lecanora dispersa f. coniotropa (Fr.) Arnold
Lecanora invadens H. Magn.
Thallus crustose, restricted to the apothecia edges, often superficial and effuse, pale grey, grey-greenish. Apothecia scattered or clustered, sessile, 0.4-1 mm diam., discs smooth, flat to convex, usually pruinose, rather dark yellow-brownish with dark blue-greenish to blackish spots, often lead-grey tinged blue-greenish, epithecium blue-greenish with a few (soluble in K) granules, exciple pruinose, minutely crenulate, whitish. Ascospores simple, hyaline, broadly ellipsoid, 9-12 x 6-7.5 µm. Exciple: C- or C+/- yellow, K- or K+/- yellow, KC+ yellow, P-; disc: C-, K- or K+/- yellow, KC+/- yellow, Pd-, UV- or UV+ yellowish. Rare, on acid or almost neutral rocks, often in association with other lichens thriving in the same habitats: Aspicilia sp., Lecanora sp., Verrucaria sp. N.B. This taxon is very close, and may well be a simple morphotype of Lecanora semipallida. In fact this taxon is diversely ranked according to the authors. Here, we put emphasis on chemical, morphological and habitat traits, but the usual restrictions on the assigned ranking should apply until further research clarifies the issue.*