Pertusaria stenhammarii Hellb.

K. Svensk. Vetensk.-Akad. Förh., 22: 463, 1866.
Synonyms:
Distribution: N - TAA (Nascimbene & al. 2007b).
Description: Thallus crustose, continuous to faintly rimose, grey to greenish grey, covered with fruiting warts. Apothecia lecanorine, immersed in thalline warts, 1(-2) per wart, 0.2-1.2 mm across, with a regularly rounded, black but usually grey-pruinose disc, and a thin, smooth thalline margin. Epithecium yellowish to dark brown, K+ violet; hymenium colourless; hypothecium yellowish. Asci (1-)2(-3)-spored, broadly cylindrical, the apex with a broad ocular chamber, the outer sheath K/I+ blue, otherwise K/I-, with an inner extensible layer, Pertusaria-type. Ascospores 1-celled, hyaline, ellipsoid to fusiform, 60-120 x 30-60 µm, the wall 1-layered, 2-16 µm thick, smooth, the apices up to 30 µm thick. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a very rarely collected, apparently panboreal-montane species found on the bark of conifers, with optimum in the upper montane and subalpine belts. Normally fertile, but the var. elatina Erichsen, described from the Alps, is sorediate. It is included in the Italian red list of epiphytic lichens as “Data Deficient” (Nascimbene & al. 2013c).
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: extremely rare
Oromediterranean belt: absent
Montane belt: extremely rare
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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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Index Fungorum GBIF


Curtis Randall Björk CC BY-SA 4.0
British Columbia, Clearwater Valley Date: 2012-04-03 On Alnus incana trunk in swamp forest


Erichsen C.F.E. 1936. Pertusariaceae. - In: Dr. L. Rabenhorsts Kryptogamenflora von Deutschland, Österreich und der Schweiz. Bd. IX, Abt. 5, T. 1. Akad. Verlagsges., Leipzig, pp. 321-512, 513-728. - Public Domain



Curtis Randall Björk – CC BY-SA 4.0
British Columbia, Clearwater Valley Date: 2012-04-03 On Alnus incana trunk in swamp forest