Lecanora variolascens Nyl.

Flora, 64: 183, 1881.
Synonyms:
Distribution: N - TAA (Nascimbene & al. 2007b).
Description: Thallus crustose, episubstratic, smooth to rough, often verrucose especially in central parts, grey-white or yellowish white, sorediate. Medulla filled by large calcium oxalate crystals. Soralia flat to slightly convex, whitish, at first well-delimited and 0.3-1 mm across, later more or less confluent, but rarely forming a sorediate crust; soredia farinose. Apothecia often present, lecanorine, 0.5-1.5 mm across, sessile, with a flat, orange-brown to brown, often pruinose disc, and a smooth to crenulate, thick, raised, sometimes flexuose thalline margin. Thalline exciple ecorticate, pulicaris-type, with very large crystals of calcium oxalates (up to 100 μm) soluble in N; epithecium reddish brown to grey-brown, the pigment dissolving in K, with 35(-38) μm wide, brown granules on the surface of paraphyses tips, which are readily soluble in K, very slowly in N; hymenium colourless, 50-80 μm high; paraphyses 1-2 μm thick, the apical cells slightly swollen, up to 3 μm wide; hypothecium colourless to yellowish. 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 1-celled, hyaline, broadly ellipsoid, 8-12.5 x 5-9 μm. Photobiont chlorococcoid. Spot tests: thallus and soralia K+ yellow, C-, KC-, P+ bright yellow (reactionbest visible on sections under the microscope). Chemistry: atranorin (major), psoromic acid (major), chloratranorin and zeorin (minor or traces).
Note: mosty found at the base of trunks of isolated deciduous trees; perhaps overlooked, being mostly sterile. For the differences towards L. intumescens see Lumbsch & al. (1997).
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Commonnes-rarity: (info)

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

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model

Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/


S. Poumarat - Source: http://mycologie.catalogne.free.fr/lichens.htm


Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/


S. Poumarat - Source: http://mycologie.catalogne.free.fr/lichens.htm


Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/


Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/


Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/