Placopyrenium bucekii (Nádv. & Servít) Breuss

in Nimis & Poelt, Studia Geobot., 7, suppl. 1: 182, 1987. Basionym: Dermatocarpon bucekii Nádv. & Servít - Beih. Bot. Centralbl., 55 b: 267, 1936.
Synonyms: Placidium steineri Wettst.
Distribution: N - Lig (Breuss 2009). C - Tosc (Breuss 2009), Laz (Tretiach 2004), Sar (Breuss 2009, Nascimbene & al. 2023). S - Pugl (Nimis & Tretiach 1999), Bas, Cal (Puntillo 1996, Breuss 2009), Si (Nimis & al. 1996b, Grillo 1998, Grillo & Caniglia 2004, Iacolino & Ottonello 2006).
Description: Thallus crustose-subplacodioid, well-developed, episubstratic, areolate-subsquamulose, pale grey and whitish-pruinose when dry, brownish when wet, forming several cm wide patches (rarely >10 cm), the areoles slightly concave to flat, constricted at base, with conspicuous black sides and a black lower surface, the central ones (formed only in old thalli) rectangular or polygonal, 0.3-2.6 x 0.2-1.6 mm, the peripheral ones lobed, elongate, irregularly radiating, (1-)1.5-3(-4) x 0.3-1(-2) mm, often loosely attached and overlapping. Upper cortex up to 40 µm thick, poorly differentiated, paraplectenchymatous, of angular cells arranged in vertical rows, with thin, brown-pigmented walls, overlain by a 3-9 µm thick epinecral layer; photobiont layer of vertically arranged columns of algal cells, 80-250(-500) μm thick; lower cortex of irregularly arranged, rounded cells with 0.5-2 μm thick, dark brown walls. Perithecia immersed in the central areoles, up to 10 per areole, visible from above as 0.1-0.2 mm wide, black dots. Involucrellum absent or rudimentary and lid-like above the ostiole; exciple brown and 30-50(-80) μm thick in upper part, colourless and 20-30 μm thick in lower part, paraplectenchymatous; periphyses well-visible around the ostiole, 30-40 x 1-3 μm; paraphyses degenerating early, usually not visible; hymenial gel hemiamyloid, I+ red (I+ blue at very low concentrations of I), K/I+ blue. Asci 8-spored, clavate, I-, fissitunicate, the wall thickened above with an indistinct ocular chamber, Verrucaria-type. Ascospores 0-1-septate, hyaline, ellipsoid to subfusiform, 11.5-17.5 x 4-7.5 μm, with a very thin perispore. Pycnidia immersed, multilocular, Dermatocarpon-type. Conidia bacilliform, (3-)3.5-5.5(-9) x l-l.5 μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a mainly Mediterranean lichen with outposts in dry-warm temperate areas, found on base-rich siliceous rocks, exceptionally on limestone and sometimes even on soil, often occurring together with Peltula euploca, but with a different ecology, being most common on dust-impregnated faces. It should be looked for in suitable habitats of the Alps, especially in dry-warm situations. For a very detailed description see Menard & Roux (1995).
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
On otherwise dry surfaces with short periods of water seepage after rain

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: very rare
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: rather rare
Dry mediterranean belt: rather rare

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 12744



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (12744)
2001/11/28
detail of areole with perithecia


Andres Saag; Owner: University of Tartu



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (10467)
2003/03/12



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (12744)
2003/03/12



Domenico Puntillo; Owner: Department of Life Sciences, University of Trieste
Italy, Calabria, Cosenza, Valle del Fiume Arente (Castiglione Cosentino, CS); altitude: 213 m
21/02/2017



Domenico Puntillo; Owner: Department of Life Sciences, University of Trieste
Italy, Calabria, Cosenza, Valle del Fiume Arente (Castiglione Cosentino, CS); altitude: 213 m
21/02/2017



Domenico Puntillo; Owner: Department of Life Sciences, University of Trieste
Italy, Calabria, Cosenza, Valle del Fiume Arente (Castiglione Cosentino, CS); altitude: 213 m
21/02/2017



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (26891)
2001/12/11


Nere Sorrentino
Spain, Canary Islands, Tenerife


Nere Sorrentino
Spain, Canary Islands, Tenerife


Nere Sorrentino
Spain, Canary Islands, Tenerife


Nere Sorrentino
Spain, Canary Islands, Tenerife


Nere Sorrentino
Spain, Canary Islands, Tenerife


Nere Sorrentino
Spain, Canary Islands, Tenerife


Nere Sorrentino
Spain, Canary Islands, Tenerife


Nere Sorrentino
Spain, Canary Islands, Tenerife



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (12744)
2001/11/28