Bacidina delicata (Leight.) V. Wirth & Vězda

in Wirth, Stuttg. Beitr. Naturk., ser. A, 517: 62, 1994. Basionym: Lecidea effusa var. delicata Larbal. ex Leight. - Lich. Fl. Gr. Brit., 3rd ed.: 371, 1879.
Synonyms: Bacidia arceutinella Zahlbr.; Bacidia delicata (Leight.) Coppins; Bilimbia arceutinoides Anzi; Woessia delicata (Leight.) Sérus. & Diederich
Distribution: N - Frl (Nascimbene & Salvadori 2008, Nascimbene & al. 2009b), Ven (Anzi Lich. Lang. 434: Printzen 1995, Nascimbene & Salvadori 2008), TAA (Nascimbene & al. 2021, 2022), Piem (Matteucci & al. 2013). C - Tosc (Tretiach & Nimis 1994, Benesperi 2011), Laz, Abr (Caporale & al. 2016). S - Camp (Nimis & Tretiach 2004, Garofalo & al. 2010), Pugl (Nimis & Tretiach 1999).
Description: Thallus crustose, pale green to pale brown, thin, finely granular, covered in (15-)20-40(-50) μm thick, soredia-like goniocysts. Apothecia biatorine, (0.2-)0.3-0.6(-0.7) mm across, with a flat, white to pale orange-pink disc (turning more distinctly orange in the herbarium) and a thin proper margin. Proper exciple colourless, of gelatinised cells; epithecium not clearly differentiated from the hymenium; hymenium colourless, 35-55 μm high; paraphyses 1.5-2 μm thick, simple or forked in upper part, the apical cells often swollen, up to 5 μm wide; subhymenium often very pale yellow; hypothecium colourless. Asci 8-spored, cylindrical-clavate, approaching the Bacidia-type, but the ocular chamber wider, and the axial body never penetrating through the entire d-layer, surrounded by a narrow, darker amyloid layer. Ascospores 3-7-septate, hyaline, acicular, (20-)25-48 x 1-1.5(-2) μm, without a perispore. Pycnidia white, more or less immersed. Conidia filiform, curved, 20-40 x c. 1 μm. Photobiont chlorococcoid, the cells 5-10(-12) μm in diam. Spot tests: thallus and apothecia K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a Mediterranean-Atlantic to humid subtropical species found on bark, especially of Sambucus and Salix and - but only in very humid areas - on roofing tiles and plant debris.
Growth form: Crustose
Substrata: bark and rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (13792)