Lecanora gisleri (Arnold) Arnold

Lich. Exs.: 1525, 1891. Basionym: Biatora gisleri Anzi ex Arnold - Verh. zool.-bot. Ges. Wien, 21: 1139, 1871.
Distribution: N - Frl, TAA (Nascimbene & al. 2007b), Lomb (Hinteregger 1994), Piem (Isocrono & al. 2004).
Description: Thallus crustose, episubstratic, smooth to warted, sometimes finely areolate, yellowish white to grey-white, rarely delimited by a dark prothallus. Medulla white, I+ blue. Apothecia indistinctly lecanorine to biatorine, rounded to angular in outline, 0.3-0.6 mm across, sparse to crowded, slightly constricted at base, with a pale brown, red-brown, finally dark brown to(rarely) brown-black, dull, at first concave, then flat to convex disc, and a concolorous, smooth, finally often excluded margin. Thalline margin not always present, or developed only at the base of the apothecia, corticate, the cortex 20-30 µm thick, the medulla with a few algae mostly concentrated towards the base; proper exciple colourless to pale brown; epithecium orange-brown to brown-black, in pale apothecia with a granular epipsamma, the granules dissolving in K but not in N; hymenium colourless, 80-120 µm high, I+ dark blue; paraphyses coherent, 1.5-2 µm thick, often branched in upper part, the apical cells 3-4 µm wide, with dark cell walls; hypothecium colourless, 90-120 µm high, I+ pale blue. Asci 8-spored, clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a blue outer layer, Lecanora-type. Ascospores often poorly developed, 1-celled, hyaline, narrowly ellipsoid, 11-17 x 5-7 µm. Photobiont chlorococcoid. Spot tests: thallus K- or K+ very pale yellow, C-, KC-, P+ orange-red. Chemistry: fumarprotocetraric acid.
Note: a probably circumboreal-montane lichen found on twigs of shrubs, especially Rhododendron ferrugineum in the subalpine belt; probably restricted to the Alps in Italy.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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

pH of the substrata:


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Altitudinal distribution:


Predictive model