Buellia schaereri De Not.

Giorn. Bot. Ital., 2: 199, 1846.
Synonyms: Buellia destructans (Tobler) R. Sant.; Buellia nigritula (Nyl.) Mudd; Karschia destructans Tobler; Lecidea nigritula Nyl.
Distribution: N - VG, Frl, Ven (Nascimbene & Caniglia 2000, 2003c, Nascimbene & al. 2006e, Nascimbene & Marini 2007), TAA (Nascimbene 2006b, 2006c, 2008b, 2013, 2014, Nascimbene & al. 2006, 2006e, 2007b, 2009, 2010, 2014, Stofer 2006, Nimis & al. 2015), Lomb, Piem (Isocrono & al. 2004), Emil (Nimis & al. 1996, Fariselli & al. 2020), Lig (TSB 33052). C - Tosc (Putortì & Loppi 1999, Brunialti & Frati 2010, Brunialti & al. 2012b), Marc (Nimis & Tretiach 1999), Laz, Abr (Nimis & Tretiach 1999), Mol (Nimis & Tretiach 1999, Caporale & al. 2008). S - Camp (Aprile & al. 2002, 2003b, Nimis & Tretiach 2004, Garofalo & al. 2010), Cal (TSB 13945).
Description: Thallus crustose, often almost entirely hidden in the substrate, sometimes thinly episubstratic and rimose-cracked, appearing as a greyish white to olive brown patch. Medulla non-amyloid. Apothecia lecideine (0.1-)0.2-0.3(-0.5) mm across, soon sessile, with a black, epruinose, first flat then soon convex disc, and a thin, soon excluded proper margin. Proper exciple narrow, poorly differentiated, dark in outer part; epithecium brown; hymenium colourless, 35-60 µm tall, not inspersed with oil droplets; paraphyses simple to moderately branched, apically swollen, with a brown pigment cap; hypothecium brown. Asci 8-spored, clavate, Bacidia-type. Ascospores 1-septate, soon brown, ellipsoid with obtuse ends, not constricted at septum, 6-10(-12) x 2.5-4(-4.5) µm, not ornamented. Pycnidia often numerous, globose, unilocular. Conidia very short, oblong to elliptical, some of them almost globose, 1.5-3 x 0.5-1(-1.4) µm. Photobiont chlorococcoid. Spot tests: all negative. Chemistry: no lichen substances.
Note: a mainly cool-temperate to boreal-montane, circumpolar species found on acid bark, especially of conifers, and on wooden poles in upland areas, to be looked for further in the mountains of southern Italy.
Growth form: Crustose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: rather common
Oromediterranean belt: absent
Montane belt: rather rare
Submediterranean belt: very rare
Padanian area: absent
Humid submediterranean belt: very rare
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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P.L. Nimis CC BY-SA 04
TSB 13376


Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php (Courtesy: Anita Stridvall)



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (13376)
2001/11/22