Lecanora leptyrodes (Nyl.) Degel.

Ark. Bot., 24a, 3: 82, 1931. Basionym: Lecanora angulosa var. leptyrodes Nyl. - Flora, 57: 16, 1874.
Synonyms: Lecanora nemoralis Makar. non auct.; Lecanora pycnocarpa H. Magn.
Distribution: N - VG, Frl, Ven (Lazzarin 1997, Nascimbene & Caniglia 2002c, 2003c, Nascimbene 2005c, 2008, 2008c, Nascimbene & Marini 2007), TAA (Nascimbene & Caniglia 2000, 2000b, Nascimbene & al. 2005, 2006, 2006e, 2007b, 2008b, 2009, 2014, Nascimbene 2014, Nimis & al. 2015), Lomb (Alessio & al. 1995, Valcuvia & Truzzi 2007b, Gheza & al. 2020), Piem (Caniglia & al. 1992, Isocrono & al. 2003, Piervittori 2003, Isocrono & Piervittori 2008), VA (Matteucci & al. 2008, Isocrono & al. 2008, Ongaro & al. 2022), Emil (Bassi 1995, Nimis & al. 1996, Fariselli & al. 2020), Lig (Putortì & al. 1999b, Giordani & Incerti 2008). C - Tosc (Tretiach & Nimis 1994, Loppi & al. 1994, 1997b, 1998, Loppi & De Dominicis 1996b, Putortì & al. 1998, Benesperi & al. 2007, Benesperi 2011), Marc (Nimis & Tretiach 1999), Umb (Ravera 1998, Ravera & al. 2006, Panfili 2007), Laz (Nimis & Tretiach 2004), Abr (Nimis & Tretiach 1999, Corona & al. 2016, Gheza & al. 2021), Mol (Nimis & Tretiach 1999, Caporale & al. 2008), Sar (Rizzi & al. 2011, Cossu 2013). S - Camp (Garofalo & al. 1999, 2010, Aprile & al. 2002, 2003, 2003b, Brunialti & al. 2013, Ravera & Brunialti 2013, Catalano & al. 2016), Pugl (Nimis & Tretiach 1999), Bas (Nimis & Tretiach 1999), Cal (Puntillo 1996, Incerti & Nimis 2006), Si.
Description: Thallus crustose, continuous or cracked, whitish to grey, smooth, epruinose, sometimes delimited by a white prothallus. Apothecia lecanorine, round to angular, sessile, rarely crowded, 0.2-1 mm across, with an orange-brown to flesh-coloured, but heavily white-pruinose, flat to slightly convex disc, and a rather thick, persistent, prominent, usually flexuose thalline margin. Thalline exciple with a loose, hydrophobic pseudocortex (the hyphae of the medulla almost reaching the margin) containing crystals which are not readily soluble in K; proper exciple thin, colourless, filled with crystals; epithecium greenish grey to almost colourless, with numerous crystals, K+ green; hymenium colourless 50-80 µm high; paraphyses slightly thickened at apex (up to 2.5 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, simple, broadly ellipsoid, 10-14(-15) x 5.5-8.5 µm, the wall <1 µm thick. Photobiont chlorococcoid. Spot tests: thallus K+ yellow, C-, KC-; disc of apothecia (pruina) C+ bright lemon yellow; margin of apothecia P+ pale yellow. Chemistry: thallus with atranorin (major), chloroatranorin and eugenitol (minor); apothecia with sordidone (major).
Note: a mainly cool-temperate early coloniser on the smooth bark of young trunks and branches (especially of Fagus and Betula) which, however, is able to persist on ancient trees as well, with optimum in beech forests, where it is locally common and sometimes even abundant, especially in humid areas. See also note on L. subcarpinea.
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Pioneer species

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: rare
Oromediterranean belt: absent
Montane belt: extremely common
Submediterranean belt: rare
Padanian area: extremely rare
Humid submediterranean belt: rather 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 21984

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (34316)

P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (15441)

P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (15441)

Domenico Puntillo; Owner: Domenico Puntillo

P.L. Nimis CC BY-SA 04
TSB 34362