Psoronactis dilleniana (Ach.) Ertz & Tehler

in Ertz & al., Fungal Divers., 70: 46, 2014. Basionym: Lichen dillenianus Ach. - Lichenogr. Suec. Prodr.: 57, 1798.
Synonyms: Lecanactis dilleniana (Ach.) Körb.; Schismatomma epipolium A. Massal.
Distribution: N - TAA (Lojka Lich. Univ. 86: Egea & Torrente 1994, Nascimbene & al. 2022), Piem (TSB 32833), Lig. C - Tosc. S - Camp (Ricciardi & al. 2000).
Description: Thallus crustose, episubstratic, up to 3 mm thick, more or less effuse, somewhat tomentose-scurfy, ecorticate, soft, areolate to verrucose, whitish to very pale grey, more or less tinged mauve-pink or pink-orange, sometimes delimited by a thin dark prothallus. Medulla white, I+ blue. Apothecia immersed to subsessile, constricted at base, (0.4-)0.6-1.5(-2) mm wide, round, angular or elongate, with a more or less exposed, black but often grey-pruinose, flat to convex disc, and a raised, blackish, epruinose, persistent proper margin. Proper exciple dark brown, K+ olivaceous green; epithecium brown; hymenium colourless, 70-100 µm thick, I+ red; paraphysoids mostly simple, 1.5-2 μm thick, with slightly enlarged apical cells; subhymenium 15-25 µm high, brownish, K+ olivaceous green, I+ blue; hypothecium black, carbonized, up to 280 µm thick. Asci 8-spored, cylindrical-clavate, fissitunicate, the apex with a K/I+ pale blue apical dome penetrated by a small ocular chamber. Ascospores 3-septate, fusiform, straight or slightly curved, 18-33 x 4-5 µm. Pycnidia rare, black, semi-immersed, with a dark brown wall. Conidia bacilliform, straight, 5-8 x 1-1.5 µm. Photobiont trentepohlioid. Spot tests: thallus K-, C-, KC-, P+ yellow-orange; medulla UV+ glaucous or yellowish grey. Chemistry: psoromic and 2’-0-demethylpsoromic acids, plus variable amounts of schizopeltic acid.
Note: on hard crystalline rocks, beneath overhangs and in crevices which are seldom wetted by rain, mostly in upland areas.
Growth form: Crustose
Substrata: rocks
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
In underhangs rarely wetted by rain

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: very 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
Herbarium samples
Index Fungorum GBIF

Ulrich Kirschbaum CC BY-SA 4.0 - Source: https://www.thm.de/lse/ulrich-kirschbaum/flechtenbilder
Central Europe: Germany. (Coll/ident: D. Teuber).



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (32833)
2002/12/13
sterile thallus



Pier Luigi Nimis CC BY-SA 4.0
TSB 41614



Curtis Randall Björk – CC BY-SA 4.0
British Columbia, Clearwater Valley Date: 2013-10-02 Basalt cliff in waterfall sprayzone, north-facing



Pier Luigi Nimis CC BY-SA 4.0
TSB 41615



Pier Luigi Nimis CC BY-SA 4.0
TSB 41615


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=231&lang=en
France, Pointe de Dinan


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=231&lang=en
France, Pointe de Dinan


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=231&lang=en
France, Pointe de Dinan


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=231&lang=en
France, Pointe de Dinan


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=231&lang=en
France, Pointe de Dinan


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=231&lang=en
France, Pointe de Dinan


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=231&lang=en
France, Pointe de Dinan


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=231&lang=en
France, Pointe de Dinan



Pier Luigi Nimis CC BY-SA 4.0
TSB 41615