Buellia erubescens Arnold

Verh. zool.-bot. Ges. Wien, 25: 493, 1875.
Synonyms: Buellia jorgei Samp.; Buellia zahlbruckneri J. Steiner non sensu T. Schauer
Distribution: C - Tosc (Benesperi & al. 2007), Umb (Ravera 2000, Ravera & al. 2006), Laz (Ruisi & al. 2005), Mol (Nimis & Tretiach 1999, Caporale & al. 2008). S - Camp (Garofalo & al. 1999, 2010, Aprile & al. 2003b), Cal (Puntillo 1996, Incerti & Nimis 2006).
Description: Thallus crustose, episubstratic, smooth to rimose, white to whitish grey, often delimited by a black prothalline line. Medulla white, lacking calcium oxalates, I- Apothecia lecideine, black, (0.3-)0.5-0.8(-1.2) mm across, sessile, with a flat to convex, often pruinose disc, and an initially thick, later thinner and finally excluded proper margin. Proper exciple well developed, 80-125 μm wide in lower part, brown throughout, dispersa-type, N-, K+ yellow or K+ yellow then red (red crystals); epithecium brown, N-, in pruinose specimens inspersed with crystals reacting K+ red; hymenium colourless, not inspersed with oil droplets, (80-)100-110 µm high; paraphyses simple to sparingly branched, the apical cells slightly swollen, 2-4 μm wide, with a dark cap. Asci 8-spored, clavate, Bacidia-type. Ascospores 1-septate, not constricted at septum, brown, ellipsoid to broadly ellipsoid, not curved, (10-)13-16(-18) x (6-)7-8.5(-9.5) µm, Physconia-type when young, Buellia-type when mature, with a rough to faint microrugulate ornamentation. Pycnidia rare, black, immersed. Conidia bacilliform, 6-9 x 0.5-1 µm. Photobiont chlorococcoid. Spot tests: K+ yellow or K+ yellow-orange turning red, C-, KC-, P- or P+ faintly yellow. Chemistry: chemotype 1) atranorin, norstictic and connorstictic acids, plus traces of salazinic and hyposalazinic acids, zeorin and an unknown secalonic acid derivative; chemotype 2) atranorin, traces of norstictic and connorstictic acids, and of a secalonic acid derivative.
Note: on acid and smooth bark in warm-humid areas. All earlier records of this species from upland areas of the Alps and of the northern Apennines (see Nimis 1993: 138) are attributed to Tetramelas chloroleucus following Giralt & al. (2000); some records could refer to the recently-described B. iberica. The species is included in the Italian red list of epiphytic lichens as “Data Deficient” (Nascimbene & al. 2013c).
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: extremely rare
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: very rare
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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E. Pittao CC BY-SA 4.0
TSB 12164



E. Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (26662)
2008.03.31



E. Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (33232)
2008.03.31



Juri Nascimbene - CC BY-SA 4.0
Paneveggio, Reg. Trentino-Alto Adige Prov. Trento, Italy.



Juri Nascimbene - CC BY-SA 4.0
Paneveggio, Reg. Trentino-Alto Adige Prov. Trento, Italy.



E. Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (12164)
2008.03.31