Acrocordia cavata (Ach.) R.C. Harris

in Vezda, Sched. ad Lich. Sel. Exs., 50: 2 (nr. 1229), 1974. Basionym: Verrucaria cavata Ach. - Syn. Meth. Lich.: 91, 1814.
Synonyms: Arthopyrenia cavata (Ach.) R.C. Harris
Distribution: N - Frl, TAA (Thor & Nascimbene 2007, Nimis & al. 2015, Nascimbene & al. 2022). C - Umb (Ravera 1998, Ravera & al. 2006), Laz (Ravera 2001, Stofer 2006), Sar (Zedda 2002, 2002b). S - Pugl (Nimis & Tretiach 1999), Bas (Puntillo & al. 2012), Cal (Puntillo 1995, 1996).
Description: Thallus crustose, endosubstratic, whitish or pale greenish grey, thin, smooth, ecorticate. Perithecia black, 0.3-0.6 mm across, half-immersed, the projecting part hemispherical. Involucrellum brown-black, completely surrounding a globose, colourless or pale brownish exciple; hamathecium of persistent, slender, sparingly branched, long-celled pseudoparaphyses, periphyses absent; hymenial gel I-, K/I-. Asci 8-spored, cylindrical, K/I-, fissitunicate, the apical dome with a broad ocular chamber surmounted by a hemispherical meniscus-like structure. Ascospores 1-septate, hyaline, ellipsoid with rounded ends, (9-)11-16.5 x 5-9.5 μm, uniseriately arranged in the asci, surrounded by a perispore which appears verrucose in water, smooth in K. Pycnidia unknown. Photobiont trentepohlioid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a mild-temperate, incompletely holarctic species of smooth bark in humid deciduous forests. Rare throughout the country, but most frequent in Tyrrhenian Italy.
Growth form: Crustose
Substrata: bark
Photobiont: 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: rare
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: extremely rare
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 8832

Domenico Puntillo; Owner: Domenico Puntillo
Italy, Puntillo 7397