Candelariella lutella (Vain.) Räsänen

Ann. Soc. Scient. Argentina, 128: 57, 1939. Basionym: Lecanora xanthostigma var. lutella Vain. - Meddeland. Soc. Fauna Fl. Fenn., 3: 102, 1878.
Distribution: N - Frl, Ven, TAA (Nascimbene & al. 2007b, 2014, Nascimbene 2014), Piem (Morisi & Sereno 1995), Emil (Fariselli & al. 2020). C - Marc (Frati & Brunialti 2006), Abr (Nimis & Tretiach 1999, Caporale & al. 2016). S - Bas (Ravera & al. 2015d).
Description: Thallus crustose, of scattered to crowded minute areoles or granules, forming small patches to 3.5 mm in diam, typically at the base of small twigs or along cracks in the bark. Areoles flat to slightly convex, rounded to irregular in outline, up to c. 0.25 mm wide, greenish yellow to pale yellow. Apothecia common, lecanorine, 0.15-0.4(-0.6) mm wide, with a deep yellow, flat to convex disc, and a thin, uneven, entire or granular, finally often excluded margin. Epithecium yellow-brown, covered by a granular epipsamma; hymenium colourless, 60-75 µm high; paraphyses simple or sparingly branched in upper part, with slightly swollen, to 3.5 µm wide upper cells hypothecium colourless. Asci 24-32-spored, clavate, with an apical dome which is I+ blue only in the internal, lower part, interrupted in the centre by an I+ paler blue strip, Candelaria-type. Ascospores 1-celled to 1-septate, hyaline, oblong to ovoid, 7-12 x 4-5 µm. Photobiont chlorococcoid. Spot tests: thallus and apothecia K- or K+ reddish-orange, C-, KC-, P-. Chemistry: pulvinic acid derivatives.
Note: a cool-temperate, perhaps holarctic lichen of smooth bark, especially of Alnus; overlooked, or confused with similar species, but certainly not common. It is included in the Italian red list of epiphytic lichens as “Data Deficient” (Nascimbene & al. 2013c).
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: very rare
Oromediterranean belt: absent
Montane belt: very rare
Submediterranean belt: very rare
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (1660)

Andres Saag

Courtesy: Olivier et Danièle Gonnet - Source:
France, Névache - Hautes-Alpes

Courtesy: Olivier et Danièle Gonnet - Source:
France, Névache - Hautes-Alpes