in Saag & al., Lichenologist, 41: 41, 2009. Basionym: Lecanora leuckertiana Zedda - Nova Hedwigia, 71: 108, 2000.
Distribution: N - TAA (Nascimbene & al. 2014, 2022, Nascimbene 2014, Nascimbene & Marini 2015, Trindade & al. 2021). C - Sar (Zedda 2000b, 2002, 2002c, Zedda & al. 2001).
Description: Thallus leprose, cottony and powdery to granular, thick, whitish green to grey-green, diffuse or weakly delimited, firmly attached to the substratum, the margins delimited, but not forming true lobes (obscure sublobes sometimes present). Granules soredia-like, abundant, fine to coarse, up to 500 μm in diam., not well separated from each other, without projecting hyphae. Medulla present, well developed, white, forming a cottony layer which is sometimes exposed in patches. Hypothallus absent. Photobiont chlorococcoid, the cells 10-12 µm wide. Spot tests: K-, C-, KC-, P-. Chemistry: usnic acid, zeorin, isousnic acid (traces), triterpenes.
Note: on old trees in humid, but well-lit situations, with optimum in humid Mediterranean forests. The species has been reported also from eastern central Europe, but these records may refer to another lichen (see Bayerovà & Kukwa 2004). It is included in the Italian red list of epiphytic lichens as “Endangered” (Nascimbene & al. 2013c).
Growth form: Leprose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)