Lecanora expallens Ach.

Lichenogr. Univ.: 374, 1810.
Synonyms: Lecanora conizaea (Ach.) Nyl. non auct.; Lecanora foehrensis Erichsen; Lecidea soraliata Vain.
Description: Thallus crustose, usually endosubstratic in non-sorediate parts, episubstratic in sorediate parts, thin, yellowish green, at first forming small orbicular patches up to 1-2 cm across, which later become confluent and may cover extensive areas, often delimited by a whitish to bluish grey prothallus. Fertile specimens sometimes with esorediate, slightly convex, to 0.2 mm wide, ecorticate areoles, sorediate specimens with diffuse, farinose (20-50 µm in diam.), yellowish green soredia which finally cover almost the whole thallus, giving it a subleprose appearance. Apothecia rare, lecanorine, up to 1.5 mm across, with a dull yellow to pale brown, sometimes pruinose, flat to slightly convex disc and a weakly prominent, often persistent, sorediate thalline margin. Thalline exciple of irregularly entangled hyphae; epithecium pale yellow, with numerous small yellowish crystals soluble in K; hymenium colourless; paraphyses simple to weakly branched and anastomosing, 1.5-2.5 µm thick at mid-level, the apical cells slightly thickened; hypothecium colourless to pale yellow. Asci 8-spored, clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid to broadly ellipsoid, (7.5-)9-13(-16) x (3-)4.5-6(-7.5) µm. Photobiont chlorococcoid. Spot tests: thallus and soredia K+ pale yellow, C+ deep yellow to orange, KC+ orange, P-; UV+ brownish orange (long wave) or UV+ dull violet (short wave), K/UV+ mint-green turning golden yellow when dry. Chemistry: usnic acid, zeorin, thiophanic acid (major), unidentified xanthones, expallens-unknown.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Montane belt: very rare
Dry submediterranean belt: common
Humid submediterranean belt: very common
Padanian area: rare

pH of the substrata:

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Poleotolerance:

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Altitudinal distribution:

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Rarity

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Occurrence data
Predictive map

Felix Schumm CC BY-SA 4.0
[10390], Spanien, Kanaren, La Gomera, an der Straße bei Acardece nordöstlich von Arure, 28°08.611' N, 17°18.507' W, 940 m, licht- und windoffen an Phoenix canariensis.
Leg. F. Schumm 19.04.2003 (26).


Felix Schumm – CC BY-SA 4.0
[4206], Germany, Baden-Württemberg, Kreis Ludwigsburg, im Krummbachtal zwischen Büsnau und Gerlingen, Waldrand östl. des Rappenhofes; ca. 430 m, auf Quercus, TK 7220/NW. Leg. et det. Schumm 15.05.1995.


Felix Schumm – CC BY-SA 4.0
[9583], Germany, Baden-Württemberg, Stuttgart, zwischen Stuttgart und Leonberg, an Kastanien an der Schattenalle beim Bärensee, 48°45.368' N, 9°05.505' E, 430 m, TK: 7220. Leg. F. Schumm 15.06.2002, det. F. Schumm, conf. S. Bayerova 2002


Felix Schumm – CC BY-SA 4.0
[9583], Germany, Baden-Württemberg, Stuttgart, zwischen Stuttgart und Leonberg, an Kastanien an der Schattenalle beim Bärensee, 48°45.368' N, 9°05.505' E, 430 m, TK: 7220. Leg. F. Schumm 15.06.2002, det. F. Schumm, conf. S. Bayerova 2002


Felix Schumm – CC BY-SA 4.0
[9583], Germany, Baden-Württemberg, Stuttgart, zwischen Stuttgart und Leonberg, an Kastanien an der Schattenalle beim Bärensee, 48°45.368' N, 9°05.505' E, 430 m, TK: 7220. Leg. F. Schumm 15.06.2002, det. F. Schumm, conf. S. Bayerova 2002


Felix Schumm – CC BY-SA 4.0
[9583], Germany, Baden-Württemberg, Stuttgart, zwischen Stuttgart und Leonberg, an Kastanien an der Schattenalle beim Bärensee, 48°45.368' N, 9°05.505' E, 430 m, TK: 7220. Leg. F. Schumm 15.06.2002, det. F. Schumm, conf. S. Bayerova 2002
38 Lecanora expallens u: usnic acid, z: zeorin, no: norstictic acid


Felix Schumm – CC BY-SA 4.0
[9587], Germany, Baden-Württemberg, zwischen Calw und Althengstett, Straßenallee, auf Acer, TK: 7218. Leg. F. Schumm 24.08.1990, det. F. Schumm 2002, conf. S. Bayerova 2002.


Felix Schumm – CC BY-SA 4.0
[9587], Germany, Baden-Württemberg, zwischen Calw und Althengstett, Straßenallee, auf Acer, TK: 7218. Leg. F. Schumm 24.08.1990, det. F. Schumm 2002, conf. S. Bayerova 2002.


Felix Schumm – CC BY-SA 4.0
[9587], Germany, Baden-Württemberg, zwischen Calw und Althengstett, Straßenallee, auf Acer, TK: 7218. Leg. F. Schumm 24.08.1990, det. F. Schumm 2002, conf. S. Bayerova 2002.


Felix Schumm – CC BY-SA 4.0
[10390], Spanien, Kanaren, La Gomera, an der Straße bei Acardece nordöstlich von Arure, 28°08.611' N, 17°18.507' W, 940 m, licht- und windoffen an Phoenix canariensis. Leg. F. Schumm 19.04.2003 (26).


Felix Schumm – CC BY-SA 4.0
[10390], Spanien, Kanaren, La Gomera, an der Straße bei Acardece nordöstlich von Arure, 28°08.611' N, 17°18.507' W, 940 m, licht- und windoffen an Phoenix canariensis. Leg. F. Schumm 19.04.2003 (26).


Felix Schumm – CC BY-SA 4.0
[10390], Spanien, Kanaren, La Gomera, an der Straße bei Acardece nordöstlich von Arure, 28°08.611' N, 17°18.507' W, 940 m, licht- und windoffen an Phoenix canariensis. Leg. F. Schumm 19.04.2003 (26).


Felix Schumm – CC BY-SA 4.0
[10390], Spanien, Kanaren, La Gomera, an der Straße bei Acardece nordöstlich von Arure, 28°08.611' N, 17°18.507' W, 940 m, licht- und windoffen an Phoenix canariensis. Leg. F. Schumm 19.04.2003 (26).
us: usnic acid, z: zeorin, t: thiophanic acid


Felix Schumm – CC BY-SA 4.0
[10390], Spanien, Kanaren, La Gomera, an der Straße bei Acardece nordöstlich von Arure, 28°08.611' N, 17°18.507' W, 940 m, licht- und windoffen an Phoenix canariensis. Leg. F. Schumm 19.04.2003 (26).


P.L. Nimis CC BY-SA 04
TSB 20747


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_3/Lecanora_expallens.htm
France, Sur piquet en châtaignier - Ajaccio - Corse
16/10/2018


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_3/Lecanora_expallens.htm
France, Sur piquet en châtaignier - Ajaccio - Corse
16/10/2018


Bernard Bouffinier- Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Loperhet


Bernard Bouffinier- Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Loperhet


Bernard Bouffinier- Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Loperhet


Bernard Bouffinier- Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Telgruc-sur-mer


Bernard Bouffinier- Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Telgruc-sur-mer


Bernard Bouffinier- Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Telgruc-sur-mer


Bernard Bouffinier- Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Telgruc-sur-mer


Bernard Bouffinier- Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Telgruc-sur-mer


Bernard Bouffinier- Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Telgruc-sur-mer


Bernard Bouffinier- Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Telgruc-sur-mer


Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Ardennes


Bernard Bouffinier- Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Le Guern


Bernard Bouffinier- Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Le Guern


Bernard Bouffinier- Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=493&lang=en
France, Le Guern
UV+


Ulrich Kirschbaum CC BY-SA 4.0 - Source: https://www.thm.de/lse/ulrich-kirschbaum/flechtenbilder
Central Europe


Felix Schumm - CC BY-SA 4.0
[ABL18570], Brazil, Sergipe, Parque Nacional Serra de Itabaiana. 10°45'37'' S, 37°22'15'' W, 250 m. In transitional forest to caatinga, on tree bark. Leg. M. Cáceres & A. Aptroot, (no. 18570), 18. Sept 2013, det. A. Aptroot 2013.


Felix Schumm - CC BY-SA 4.0
[ABL18570], Brazil, Sergipe, Parque Nacional Serra de Itabaiana. 10°45'37'' S, 37°22'15'' W, 250 m. In transitional forest to caatinga, on tree bark. Leg. M. Cáceres & A. Aptroot, (no. 18570), 18. Sept 2013, det. A. Aptroot 2013.