Lecidella albida Hafellner

Stapfia, 76: 153, 2001.
Synonyms: Lecidea alba Schleich. non (Roth.) Flörke; Lecidella alba auct.
Distribution: N - TAA. C - Tosc, Laz.
Description: Thallus crustose, episubstratic, whitish to grey- or yellowish green, sorediate, often delimited by a dark prothallus. Soralia at first punctiform, later confluent and irregular in outline, finally often forming a more or less continuous sorediate crust; soredia whitish or grey- yellowish-green, farinose, 20-40 μm wide. Apothecia very rare, lecideine, 0.2-0.5 mm across, with a dark brown to black, mostly flat disc, and a concolorous, slightly raised, persistent proper margin. Proper exciple brownish; epithecium blue-grey to brown-black, with crystals; hymenium colourless, 60-70 μm high, not inspersed with oil droplets; paraphyses rather coherent in water, more easily made free in K, mostly simple, the apical cells markedly swollen, with a dark cap; hypothecium colourless to pale yellowish brown; epithecium, hymenium and hypothecium with large (to 10 μm) blue crystals reacting N+ red. Asci 8-spored, clavate, with an intensely I+ blue tholus penetrated by a weakly amyloid, broadly cylindrical axial mass, and a poorly developed ocular chamber, Lecidella-type. Ascospores 1-celled, hyaline, broadly ellipsoid, (9-)15-18 x (6-)10-12 μm, often poorly developed. Photobiont chlorococcoid. Spot tests: thallus K+ yellow, C-, KC-, P+ pale yellow (reactions better visible in thick microscopic sections). Chemistry: thallus with atranorin, capistraton, aotearon, plus traces of arthothelin.
Note: a mainly central European species, growing on the smooth bark of more or less isolated individuals of acid-barked deciduous, rarely coniferous trees in non-eutrophicated, rather humid situations, mostly below the subalpine belt.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

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: very rare
Humid mediterranean belt: extremely rare
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
Herbarium samples


P.L. Nimis CC BY-SA 4.0
TSB 4236