Graphis macrocarpa (Pers.) Röhl.

Deutschl. Fl., 3, 2: 55, 1813. Basionym: Opegrapha macrocarpa Pers. - Ann. Bot. (Usteri), 7: 29, 1794.
Synonyms:
Distribution: C - Umb (Brackel 2015).
Description: Thallus crustose, finely rimose, grey to brown, dull, often delimited by a dark prothallus. Apothecia lirelliform, black, rounded to elliptical when young, later elongate, mostly erumpent, sometimes prominent, straight or curved, simple or branched, usually with rounded ends, 2-6 x 0.1-0.45 mm, with an expanded, epruinose, dark brown, shiny disc, and a well-developed, 25-60 µm thick proper margin with entire lips, usually without a thalline margin. Proper exciple black and carbonized laterally, poorly developed and not carbonized at base; epithecium brown; hymenium colourless, not inspersed with oil droplets, 90-100 µm high; paraphyses simple, dense, 1.5-2 µm thick, with brownish tips; subhymenium colourless. Asci (4-)8-spored, cylindrical-clavate, non fissitunicate, dehiscent by an apical split, K/I-, Graphis-type. Ascospores 7-13-septate with irregular, elliptical to lens-shaped lumina, hyaline, fusiform-cylindrical, 15-42 x 5-12 µm, the wall I+ blue-violet. Pycnidia rare, immersed. Conidia bacilliform, 2-5 x 1 µm. Photobiont trentepohlioid. Spot tests: cortex and medulla K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a taxon of the G. scripta-group, characterised by apothecia with rounded ends and widely exposed epruinose brown discs, found on the bark of broad-leaved trees in various forest types. See also comment on the genus.
Growth form: Crustose
Substrata: bark
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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

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

U. Kirschbaum - Source: https://www.thm.de/lse/ulrich-kirschbaum/flechtenbilder-g-h
Bavarian Alps, Germany