Pertusaria sommerfeltii (Sommerf.) Fr.

Lichenogr. Eur. Ref.: 423, 1831. Basionym: Endocarpon sommerfeltii Flörke ex Sommerf. - Suppl. Fl. Lappon.: 135, 1826.
Synonyms: Pertusaria angusticollis Anzi; Pertusaria melastoma Nyl.
Distribution: N - Frl, Ven, TAA (Nascimbene & al. 2007b, 2022), Lomb, VA (Piervittori & Isocrono 1999). C - Marc (Nimis & Tretiach 1999).
Description: Thallus crustose, endosubstratic or thinly episubstratic, continuous to faintly rimose, covered in fruiting warts, whitish, grey to greenish or yellowish grey. Apothecia verruciform-perithecioid, completely immersed in basally not strongly constricted, apically flattened thalline warts which are c. 0.2-1.2 mm in diam., 1-5 per wart, opening through dark brown punctiform pores. Epithecium dark brown to brown-black, K+ violet; hymenium colourless; hypothecium yellowish. Asci (6-)8-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, with uniseriately arranged spores. Ascospores 1-celled, hyaline, oval to ellipsoid, (18-)22-35(-46) x 10-32 µm, the wall 2-layered; outer wall: c. 1-3 µm thick, inner wall: 1-4 µm thick, smooth; apices: up to 8 µm thick. Photobiont chlorococcoid. Spot tests: K- or K+ yellow, C-, KC- or KC+ yellow, P- or P+ yellow-orange, UV- or UV+ weakly yellow. Chemistry: 4,5-dichloronorlichexanthone and stictic acid (both major), constictic acid and traces of unknowns (minor).
Note: a circumpolar, subarctic-subalpine to boreal-montane lichen found on smooth bark of subalpine shrubs; most frequent in the Alps, rarer in the Apennines.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: rather common
Oromediterranean belt: extremely rare
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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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
Index Fungorum GBIF


P.L. Nimis CC BY-SA 04
TSB 23695



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (23695)
2001/11/28


Source: https://nhm2.uio.no/typephotos/lichens/arkiv/O-L-000606d.jpg
NORWAY, NORDLAND: [s. loc.], 1820.07.00, Sommerfelt, S.C. - LECTOTYPE