Miriquidica instrata (Nyl.) Hertel & Rambold

Mitt. bot. Staatss. München, 23: 385, 1987. Basionym: Lecidea instrata Nyl. - Flora, 60: 224, 1877.
Synonyms: Biatora instrata (Nyl.) Arnold; Lecidea subobscura H. Magn.
Distribution: N - TAA, Lomb (Nascimbene & al. 2021). C - Sar (Nascimbene & al. 2021).
Description: Thallus crustose, episubstratic, minutely areolate, often starting the life-cycle on the thalli of other crustose lichens, the areoles irregularly rounded to angular, concave to flat, 0.3-0.5(-1) mm wide, brown to brown-black, waxy-dull, often with a paler, greyish margin, developing on a dark hypothallus. Medulla white, I-. Apothecia rare, at first immersed in the areoles and almost aspicilioid (surrounded by a kind of 'thalline margin'), then slightly prominent, rounded to irregular in outline, 0.3-0.5(-0.7) mm across, with a black to brown-black disc and an indistinct proper margin. Proper exciple thin, poorly developed, greenish brown to olive brown in outer part, colourless to yellow-brown within; epithecium brown to olive-brown; hymenium colourless, (35-)34-65(-70) µm high, I+ blue; paraphyses coherent, 1.5-1.7(-2.5) μm thick at mid-level, the apical cells 2-4.5(-6) μm wide; hypothecium colourless or yellowish. Asci 8-spored, broadly cylindrical to subclavate, more or less of the Lecanora-type, but with a weakly defined apical cushion and ocular chamber. Ascospores 1-celled, hyaline, broadly ellipsoid, (7-)9-12(-16) x 4-6(-7) µm. Pycnidia black, immersed. Conidia thread-like, curved, 20-22 x c. 0.5 µm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-. Chemistry: miriquidic acid.
Note: on siliceous rocks, with optimum above treeline, sometimes starting the life-cycle on other crustose lichens; probably more widespread in the Alps.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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

Einar Timdal - Source: http://nhm2.uio.no/lav/web/index.html - CC BY-NC