Lecanora glabrata (Ach.) Nyl.

Flora, 55: 250, 1872. Basionym: Lecanora subfusca var. glabrata Ach. - Lichenogr. Univ.: 393, 1810.
Synonyms: Lecanora allophana var. glabrata (Ach.) J. Steiner; Lecanora subfusca var. geographica A. Massal.; Lecanora subfusca var. rufa (Weiss) Ach.
Distribution: N - Frl, Ven (Lazzarin 2000b, Thor & Nascimbene 2007), TAA (Nascimbene & al. 2007b), Lomb, Piem, VA (Valcuvia 2000, Valcuvia & al. 2000b), Emil (Tretiach & al. 2008, Fariselli & al. 2020), Lig (Giordani & Incerti 2008). C - Tosc, Umb (Ravera 1998, Ravera & al. 2006), Laz (TSB 17944), Abr (Corona & al. 2016), Mol (Caporale & al. 2008), Sar. S - Camp (Aprile & al. 2003b), Cal (Puntillo 1996), Si (Ottonello & Salone 1994, Grillo 1998, Grillo & Caniglia 2004).
Description: Thallus crustose, usually thin and smooth, white, yellowish white or grey-white. Apothecia lecanorine, sessile, 0.3-0.6(-1.2) mm across, with a reddish brown to dark brown, rarely brown black epruinose, flat to finally convex disc, and a rather thin, smooth, usually not raised thalline margin. Thalline exciple corticate, the cortex 50-100 µm thick at base, not separated from the medulla by a crystal-free zone, the medullary part with small crystals insoluble in K; epithecium orange to orange-brown, the pigment not dissolving in K, without crystals; hymenium colourless; paraphyses slightly thickened at tips to capitate (up to 3.5 µm wide 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, 9.5-13(-14.5) x 5.5-8 µm, the wall <1 µm thick. Photobiont chlorococcoid. Spot tests: thallus K+ yellow, C-, KC-, P- or P+ pale yellow. Chemistry: atranorin (major), and unknown terpenoids in different combinations.
Note: a mainly temperate species found on smooth bark of deciduous trees; several old records require confirmation.
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: rare
Submediterranean belt: rare
Padanian area: very rare
Humid submediterranean belt: rare
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

P.L. Nimis CC BY-SA 4.0
TSB 20174

Domenico Puntillo; Owner: Domenico Puntillo

Domenico Puntillo; Owner: Domenico Puntillo

Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php . Courtesy: A. Stridvall