Ocellomma picconianum (Bagl.) Ertz & Tehler

in Ertz & al., Fungal Divers., 70: 45, 2014. Basionym: Lecania picconiana Bagl. Comm. Soc. Crittog. Ital. - 1, 3: 127, 1862.
Synonyms: Lecanactis saltelii B. de Lesd.; Lecanactis saltelii f. ecrustacea B. de Lesd.; Schismatomma picconianum (Bagl.) J. Steiner; Schismatomma picconianum var. microcarpum (Bagl. ex Arnold) J. Steiner
Distribution: N - Lig (Tehler 1993, Ertz & Tehler 2014, Watson 2014). C - Tosc (Tehler 1993, Frati & al. 2008, Brunialti & Frati 2010), Umb (Tehler 1993, Ravera & al. 2006), Laz (Tehler 1993), Abr (Caporale & Pagliani 2009, 2014b), Sar (Tehler 1993, Zedda 2002b, Neuwirth 2018). S - Camp (Nimis & Tretiach 2004, Garofalo & al. 2010), Pugl (Nimis & Tretiach 1999, Durini & Medagli 2002, 2004), Bas (Nimis & Tretiach 1999), Cal (Lich. Graec. 57: Obermayer 1996, Puntillo 1996), Si (Nimis & al. 1994, Grillo & al. 2002, Grillo & Caniglia 2004, Caniglia & Grillo 2006b, Cataldo & Minissale 2015).
Description: Thallus crustose, very thinly episubstratic, whitish, granulose-farinose or consisting of scattered areoles, ecorticate. Apothecia circular in outline, rarely oblong, erumpent, becoming sessile, 0.2-0.5 mm across, with a black but usually white-pruinose disc, and often with a conspicuous, ecorticate, white thalline margin containing large crystals of calcium oxalate, contrasting with the darker colour of the disc. Proper exciple rudimentary or very thin; epithecium brown; hymenium colourless; paraphysoids branched, not or only slightly swollen at apex; hypothecium colourless to pale brown, I+ blue, K/I+ violet. Asci 8-spored, clavate, fissitunicate, with a I+ blue ring in tholus. Ascospores 3-septate, hyaline, slightly curved, 19-30 x 4-5 μm, without a perispore. Pycnidia black. Conidia bacilliform, curved, 4-6 x 1-1.2 μm. Photobiont trentepohlioid. Spot tests: thallus K-, C-, KC-. P-, UV-. Chemistry: thallus with roccellic acid.
Note: a Mediterranean-Atlantic species, most abundant on evergreen trees in Tyrrhenian Italy, especially on Quercus ilex in humid Mediterranean woodlands. The record of Schismatomma dirinellum by Caporale & Pagliani (2009, 2014b) from Abruzzo, those by Cataldo & Minissale (2015) and Caniglia & Grillo (2006b) from Sicily, and that by Frati & al. (2008) from Tuscany most probably refer to this species.
Growth form: Crustose
Substrata: bark
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
Taxon bound to maritime-coastal situations

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: rather rare
Dry mediterranean belt: absent

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

Source: Ertz & al. 2014. A large-scale phylogenetic revision of Roccellaceae (Arthoniales) reveals eight new genera. Fungal Divers., 70, 1: 31-53.Source: Ertz & al. 2014. A large-scale phylogenetic revision of Roccellaceae (Arthoniales) reveals eight new genera. Fungal Divers., 70, 1: 31-53.