Opegrapha durieui Mont.

in Durieu, Flore Algérie Crypt., 1: 279, 1846-1849.
Synonyms: Enterographa durieui (Mont.) Redinger; Opegrapha arthonioidea (Nyl.) Nyl.; Opegrapha grumulosa var. arthonioidea Nyl.; Opegrapha polymorpha (Müll. Arg.) Müll. Arg.; Stigmatidium polymorphum Müll. Arg.
Distribution: C - Tosc, Sar. S - Pugl (Nimis & Tretiach 1999), Cal (Ravera & al. 2022b), Si (Nimis & al. 1994).
Description: Thallus crustose, episubstratic,continuous to rimose or rimose-areolate, smooth to granulose, white, sometimes with a pinkish hue, without a distinct prothallus, often forming orbicular patches. Apothecia ellipsoid to lirelliform, often curved, sometimes stellate, immersed, 0.5-3 x 0.2-0.4 mm, simple or sparingly branched, black, with an initially slit-like, later slightly expanded, sometimes whitish-pruinose disc, without a distinct proper margin, often surrounded by a pale, false thalline margin. Proper exciple thin, brown-black, extending below the hymenium; epithecium brown, 25-20 µm high; hymenium colourless, 80-125 µm high, I+ reddish; paraphysoids branched and anastomosing, 1.5-2 µm thick, the apical cells hardly swollen; subhymenium brown, 25-50 µm high, I+ blue; hypothecium brown-black, 25-75 µm high. Asci 8-spored, cylindrical-clavate, the entire endoascus faintly amyloid, the apical apparatus poorly differentiated. Ascospores 3-septate, ellipsoid to subfusiform, straight or slightly curved, 19-25 x 5-7 µm, with a 1.5-2 µm thick, gelatinous perispore. Pycnidia immersed, black, often confluent. Conidia hyaline, straight, 4-6 x 1-1.2 µm. Photobiont trentepohlioid. Spot tests: K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a mainly Mediterranean species found on steeply inclined to underhanging, generally north-facing surfaces of hard calcareous rocks near the coast. It probably does not belong to Opegrapha s.str.
Growth form: Crustose
Substrata: rocks
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)
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: absent
Humid mediterranean belt: rare
Dry mediterranean belt: extremely rare

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples


P.L. Nimis
TSB 35700



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (26213)
2001/12/15



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (38287)
2008.02.23



P.L.Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (38285)
2008.02.23



Domenico Puntillo; Owner: Domenico Puntillo
Italy



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (35700)
2003/01/22
apothecia