Buellia arnoldii Servít

in Servít & Nádvornik, Vestn. Král. Ceské Spolec. Nauk, 12: 39, 1937.
Synonyms: Hafellia arnoldii (Servít) Hafellner & Türk
Distribution: N - TAA (Nascimbene & al. 2007b).
Description: Thallus crustose, episubstratic, whitish to whitish grey, thin, continuous to rimose, smooth. Apothecia black, epruinose, lecideine, 0.4-0.8 mm across, with a flat to slightly convex disc, and a thin, persistent proper margin. Proper exciple 60-90 µm wide, K-: epithecium brown; hymenium colourless, 100-150 µm high, densely inspersed with oil droplets; apical cells of paraphyses slightly swollen, (2.5-)3-4 µm wide; hypothecium brown. Asci 8-spored, Bacidia-type. Ascospores 1-septate, brown, ellipsoid, (23-)26-29(-32) x (9-)12-15(-16.5) µm, with septum and inner wall subapically thickened, pointed at apices, often curved, smooth, Callispora-type. Photobiont chlorococcoid. Spot tests: thallus K+ yellow, C-, KC-, P- or P+ very faintly yellow. Chemistry: thallus with atranorin.
Note: a mild-temperate to humid subtropical species found on thin twigs of conifers in humid stands of the subalpine belt; probably overlooked in the Alps. For further details see Giralt & al. (2000).
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: rare
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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Solar irradiation:

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Poleotolerance:

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Altitudinal distribution:

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E. Pittao CC BY-SA 04
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E. Pittao CC BY-SA 04
TSB 13973