Lecanora printzenii Pérez-Ort., M. Vivas & Hafellner

in Lumbsch & al., Phytotaxa, 18: 76, 2011
Description: Thallus crustose, consisting of dispersed or aggregated, irregularly rounded, up to 0.3 mm wide, convex, dull yellowish green areoles, developing on the thalli of Umbilicaria-species (rarely on Psorinia) and damaging the thallus of the hosts. Apothecia lecanorine, rounded to finally irregular in outline, often crowded; sessile and constricted at base, (0.3-)0.5(-1.3) mm across, with a greenish but soon blackening, often finally pruinose disc, and an initially greenish but soon at least partly melanised (except a narrow ring all around the disc), prominent, persistent, often wavy, shiny thalline margin. Thalline exciple corticate, up to 200 μm thick laterally, the cortex 5-40 μm thick in upper part, 25-50 thick in lower part, of thick-walled hyphae, the cell walls melanised in outer part, colourless in inner part; medullary part of irregularly entangled hyphae; epithecium c. 10 μm high, dark blackish green, K-; hymenium colourless, 50-65 μm high; paraphyses sparingly branched and anastomosing, 1-2 μm thick at mid-level, the apical cells up to 5 μm wide, surrounded by a blackish green pigment; hypothecium colourless, 20-40 μm high; subhymenium 5-15 μm high. Asci 8-spored, clavate, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid, 7-11 x 4-6 μm. Photobiont chlorococcoid, the cells up to 20 μm in diam. Spot tests: K-, C-, KC- or KC+ yellowish, P+ yellow (thalline margin only) or P-. Chemistry: usnic and psoromic acids.
Note: this recently-described, parasitic lichen is hitherto known from the mountains of Spain, the Alps (Austria) and the Carpathians; it should be looked for in the Italian Alps.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
paras Umbilicaria-species (rarely of Psorinia)

pH of the substrata:


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Altitudinal distribution:


Predictive model