Lecanora chlarotera subsp. meridionalis (H. Magn.) Clauzade & Cl. Roux

Bull. Soc. Bot. Centre-Ouest, n. sér., nr. spéc. 7: 826, 1985. Basionym: Lecanora meridionalis H. Magn. - Meddel. Göteb. Bot. Trädg., 7: 82, 1932.
Distribution: N - Frl, Ven, Lomb (Arosio & al. 2000), Piem (Arosio & al. 1998, Griselli & al. 2003, Isocrono & al. 2005b), Lig (Giordani & Incerti 2008). C - Tosc (Loppi 1996, Loppi & De Dominicis 1996, Loppi & al. 1997, 1997b, 1999a, 2002c, 2006, Putortì & al. 1998, Putortì & Loppi 1999, Loppi & Putortì 2001, Paoli & Loppi 2008, Loppi & Nascimbene 2010, Benesperi & al. 2013), Laz (Nimis & Tretiach 2004), Abr (Olivieri & al. 1997, 1997b, Loppi & al. 1999, Nimis & Tretiach 1999), Sar (Zedda & Sipman 2001, Zedda 2002, Rizzi & al. 2011). S - Camp (Aprile & al. 2002), Pugl (Nimis & Tretiach 1999, Gianfreda & Matino 2020), Si (Grillo & al. 2007).
Description: Thallus crustose, smooth to slightly verrucose, white to pale grey, sometimes with a yellowish tinge, often delimited by a black prothallus. Apothecia lecanorine, sessile, 0.3-1(-1.8) mm across, with a black, concave to slightly convex disc and a thick, usually smooth, rarely crenulate thalline margin. Thalline exciple distinctly corticate, the cortex basally slightly thickened, with abundant, very large crystals insoluble in K, often intermixed with small crystals soluble in K; epithecium dark green to bluish green-brown, with abundant, coarse crystals soluble in K and N; hymenium colourless, 50-90 µm high; paraphyses slightly thickened at apex (up to 4 µm); hypothecium colourless. 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, broadly ellipsoid, 8-14 x 4-7 µm. Conidia cylindrical, 10-14 µm long. Photobiont chlorococcoid. Spot tests: thallus K+ yellow, C-, KC-, P-; margin of apothecia P- or P+ faintly yellow. Chemistry: thallus with atranorin (major) and gangaleoidin.
Note: several Italian records of this very controversial taxon related to L. chlarotera need reconfirmation; perhaps these are just forms of L. chlarotera with darker apothecial discs.
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: absent
Submediterranean belt: very rare
Padanian area: extremely rare
Humid submediterranean belt: very rare
Humid mediterranean belt: rather rare
Dry mediterranean belt: rare

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

P.L. Nimis CC BY-SA 4.0
TSB 16167