Toninia populorum (A. Massal.) Kistenich, Timdal, Bendiksby & S.Ekman

Taxon, 67: 897, 2018.. Basionym: Arthrosporum populorum A. Massal. - Mem. Lichenogr.: 128, 1853.
Synonyms: Arthrosporum accline (Flot.) A. Massal.; Arthrosporum populorum A. Massal.; Bacidia acclinis (Flot.) Zahlbr.; Bacidia populorum (A. Massal.) Trevis.; Bilimbia acclinis (Flot.) Trevis.; Bilimbia populorum (A. Massal.) Vain.; Lecidea acclinis Flot.
Distribution: N - Frl (Badin & Nimis 1996), Ven (Lazzarin 2000b, Nascimbene & Marini 2010), TAA (Nascimbene & al. 2007b), Lomb, Piem (Isocrono & al. 2004), Emil (Bassi 1995, Nimis & al. 1996, Fariselli & al. 2020), Lig (Giordani & Incerti 2008, Giordani & al. 2009). C - Tosc (Putortì & al. 1999c, Loppi & al. 2002), Umb (Ravera & al. 2006, 2006b), Laz (Bartoli & al. 1997), Abr, Sar. S - Pugl, Bas, Cal (Puntillo 1996, Puntillo & Puntillo 2004), Si (Grillo & Carfì 1997, Grillo 1998, Grillo & Caniglia 2004).
Description: Thallus crustose, endosubstratic or thinly episubstratic, continuous or rimose, sometimes granular, whitish to ash-grey. Apothecia lecideine, 0.4-0.9 mm across, black, sessile, with a flat to slightly convex disc and a thin, persistent proper margin. Proper exciple reddish brown to reddish violet, of radiating, thick-walled hyphae; epithecium olive-brown, dark greenish brown or violet-brown, N+ violet; hymenium more or less colourless, 50-65 μm high, I+ blue in upper part; paraphyses sparingly branched in upper part, c.1.5 μm thick at mid-level, the apical cells swollen 4-5 μm wide; hypothecium almost colourless to pale red-brown, the pigmented parts K+ reddish violet. Asci 8-16-spored, broadly clavate, surrounded by a gelatinous I+ blue coat, with a well-developed I+ blue tholus with a I+ darker blue tube and a well-developed ocular chamber, Bacidia-type. Ascospores 3(-5)-septate, hyaline, curved, kidney-shaped with rounded ends, 10-18 x 4-5 μm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: thallus without lichen substances.
Note: a mild-temperate lichen found on smooth bark of deciduous trees and shrubs, especially Fraxinus, Populus and Salix, with optimum in the submediterranean belt; probably declining, especially in Northern Italy.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

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: rare
Humid mediterranean belt: very rare
Dry mediterranean belt: extremely 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 317254



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (3073)
2001/11/21



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (13153)
2002/12/03



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (38417)
2008.02.23



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (317254)
2008.03.03


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



Juri Nascimbene - CC BY-SA 4.0
Lowlands of the Veneto Region, on Popullus
2015



Juri Nascimbene - CC BY-SA 4.0
Lowlands of the Veneto Region, on Popullus
2015



Juri Nascimbene - CC BY-SA 4.0
Lowlands of the Veneto Region, on Popullus
2015



Juri Nascimbene - CC BY-SA 4.0
Lowlands of the Veneto Region, on Popullus
2015



Juri Nascimbene - CC BY-SA 4.0
Lowlands of the Veneto Region, on Popullus
2015



Juri Nascimbene - CC BY-SA 4.0
Lowlands of the Veneto Region, on Popullus
2015


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall


Photo by Maria Zardini, Museo di Storia Naturale di Venezia CC BY-SA 4.0
Ad arborum cort. in prov. Vicetina et Utinensi (S. Daniele).
Trevisan Lichenotheca Veneta 70 as Bacidia populorum


Photo by Maria Zardini, Museo di Storia Naturale di Venezia CC BY-SA 4.0
Ad arborum cort. in prov. Vicetina et Utinensi (S. Daniele).
Trevisan Lichenotheca Veneta 70 as Bacidia populorum


Photo by Maria Zardini, Museo di Storia Naturale di Venezia CC BY-SA 4.0
Ad arborum cort. in prov. Vicetina et Utinensi (S. Daniele).
Trevisan Lichenotheca Veneta 70 as Bacidia populorum



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (317254)
2008.03.03



P.L. Nimis CC BY-SA 4.0
TSB 317254


Manuel Gil
Spain, Canary Islands, Lanzarote