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, sometimes pruinose. Apothecia verruciform-perithecioid, completely immersed in basally not strongly constricted, apically flattened thalline warts which are c. 0.2-1.2 mm in diam., 1-3(-5) per wart, opening through dark brown punctiform pores. Epithecium dark brown to brown-black, K+ violet; hymenium colourless; paraphyses lax, branched and anastomosing; 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(-48) x (9-)10-33 µm, the wall 2-layered, the outer wall 1-3 µm thick, the inner wall 1-4 µm thick, smooth, the apices up to 8 µm thick. Photobiont chlorococcoid. Spot tests: K- or K+ faintly yellow, C-, KC- or KC+ faintly 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 DOLICHENS


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



Felix Schumm - CC BY 4.0
[VZ1442], Jugoslavia. Montenegro: Durmitor montes, prope lacum Crno jezero haud procul Žabljak, 1500 m. Ad corticem Abietis. Leg. A. Vezda et V. Wirth, 8.8.1976. EX A. VEZDA LICHENES SELECTI EXSICCATI NR. 1442.



Felix Schumm - CC BY 4.0
[VZ1442], Jugoslavia. Montenegro: Durmitor montes, prope lacum Crno jezero haud procul Žabljak, 1500 m. Ad corticem Abietis. Leg. A. Vezda et V. Wirth, 8.8.1976. EX A. VEZDA LICHENES SELECTI EXSICCATI NR. 1442.