Lecanora horiza (Ach.) Linds.

Trans. Bot. Soc. Edinburgh, 9: 96, 1869. Basionym: Lecanora subfusca var. horiza Ach. - Lichenogr. Univ.: 394, 1810.
Synonyms: Lecanora laevis Poelt; Lecanora oleae Reichert & Galun; Lecanora palestinica Räsänen; Lecanora parisiensis Nyl.; Lecanora sienae B. de Lesd.?
Description: Thallus crustose, episubstratic, continuous to faintly rimose, white to pale yellowish white, without a prothallus or sometimes with a thin dark prothallus. Apothecia lecanorine, sessile to slightly constricted at base, (0.4-)0.6-1.2(-1.5) mm across, with a dark reddish brown, often glossy, flat disc, and a smooth, persistent thalline margin. Thalline exciple corticate, the cortex 15-20 µm thick laterally, expanding to 38-85(-150) µm at base, with fine granules soluble in K (visible under polarized light), clearly separated from the medulla by a crystal-free zone; proper exciple colourless, with crystals soluble in K; epithecium red-brown to orange-brown, the pigment not dissolving in K, without crystals; hymenium colourless; paraphyses not or only slightly thickened at apex; hypothecium colourless, not inspersed with oil droplets. 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, (11-)12-15(-17) x (6-)7-9(-9.5) µm. Photobiont chlorococcoid. Spot tests: thallus K+ yellow, C-, KC-, P- or P+ pale yellow. Chemistry: atranorin, plus a complex of unknown terpenoids of the grantii-type (major), sometimes with additional terpenoids of the campestris-type (see Malíček & al. 2017).
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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

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P.L. Nimis CC BY-SA 4.0
TSB 16584


P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (38263)
2008.02.25


P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (38263)
2008.02.25


P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (38263)
2008.02.25


A. Moro; Owner: Department of Life Sciences, University of Trieste
Sicilia, TP, Isola di Marettimo
2008.04.05


G. Incerti CC BY-SA 04
TSB 30190


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_3/Lecanora_horiza.htm
France, oct. 2015 - sur Juniperus phoenicea - Anse de l'Ile de Fazzio - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_3/Lecanora_horiza.htm
France, oct. 2015 - sur Juniperus phoenicea - Anse de l'Ile de Fazzio - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_3/Lecanora_horiza.htm
France, oct. 2015 - sur Juniperus phoenicea - Anse de l'Ile de Fazzio - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_3/Lecanora_horiza.htm
France, oct. 2015 - sur Juniperus phoenicea - Anse de l'Ile de Fazzio - Corse


Ulrich Kirschbaum CC BY-SA 4.0 - Source: https://www.thm.de/lse/ulrich-kirschbaum/flechtenbilder
On Cupressus sempervirens. SE-Europe; N-Cyprus; SE of Girne; Beşparmak Mountains; between Girne Kayasi and Armenian Monastery (Sourp Margar


Ulrich Kirschbaum CC BY-SA 4.0 - Source: https://www.thm.de/lse/ulrich-kirschbaum/flechtenbilder
On Cupressus sempervirens. SE-Europe; N-Cyprus; SE of Girne; Beşparmak Mountains; between Girne Kayasi and Armenian Monastery (Sourp Margar


Ulrich Kirschbaum CC BY-SA 4.0 - Source: https://www.thm.de/lse/ulrich-kirschbaum/flechtenbilder
On Pinus halepensis/brutia. SE Europe; N-Cyprus; SE of Girne; Beşparmak Mountains; between Alevkaya and Antiphonitis Monastery


Ulrich Kirschbaum CC BY-SA 4.0 - Source: https://www.thm.de/lse/ulrich-kirschbaum/flechtenbilder
On Pinus halepensis/brutia. SE Europe; N-Cyprus; SE of Girne; Beşparmak Mountains; between Alevkaya and Antiphonitis Monastery


Source: Svensson, M., Ekman, S., Arup, U., Eide Ekman, L., Hammarström, O., Isaksson, R., Jonsson, F., Palice, Z., Vicente, R. & Westberg, M. 2024. Further additions to the Swedish flora of lichenised fungi. Graphis Scripta 36 (2): 15–49. Oslo. ISSN 2002-4495. - CC BY-4.0
glossy, dark brown apothecia and a rather narrow and smooth thalline margin (field photo from southern Öland). Bar = 1 mm.