Myriospora scabrida (Hedl. ex H. Magn.) K. Knudsen & Arcadia

in Arcadia & Knudsen, Opuscula Philolichenum. 11: 22. 2012.. Basionym: Acarospora scabrida Hedl. ex H. Magn. - Göteborg. Vetensk.-och Vitter.-Handl., Ser. 4, 28, 2: 55, 1924
Synonyms: Silobia scabrida (Hedl. ex H. Magn.) M. Westb.; Trimmatothelopsis scabrida (Hedl. ex H. Magn.) Cl. Roux & Nav.-Ros.
Distribution: C - Tosc (Nascimbene & al. 2021).
Description: Thallus crustose-areolate to subsquamulose, the areoles round in outline, at first bullate, then flat to slightly convex, smooth, scattered to crowded, becoming subsquamulose, incised to irregularly lobed, often imbricate, the fertile ones 0.5-3.5(-7) mm wide, pale grey to brown, rarely partly white-pruinose. Epicortex 10-23 μm thick; cortex paraplectenchymatous, 40-60 μm thick, of isodiametric cells, without crystals; algal layer interrupted by thick anticlinal bundles of medullary hyphae; medulla white, prosoplectenchymatous; lower cortex absent. Apothecia rounded, 0.2-1(-1.8) mm across, at first immersed but the mature ones distinctly raised above the thallus, 1-7(-12) per areole, with a red-brown to almost black, flat, often scabrid, epruinose disc surrounded by a distinct, somewhat raised, often blackened parathecial margin, the thalline margin poorly developed. Proper exciple up to 120 μm wide laterally, colourless to yellow-brown, the uppermost cells with golden to dark brown walls; epithecium dark golden brown to yellowish brown, 10-15 µm high; hymenium colourless, (110-)140-170 μm high; paraphyses 1-1.5 μm thick at mid-level, the apical cells to 4 μm wide; subhymenium brownish, 30-50 µm high; hypothecium 12-17 µm high, prosoplectenchymatous. Asci 100-200-spored, clavate, the apical dome K/I-, 75-90 x 15-20 µm. Ascospores 1-celled, hyaline, ellipsoid, (3-)4-5 x (1.5-)1.7-2 μm. Pycnidia rare. Conidia ellipsoid to subglobose, 1.5-2.5 x c. 1 μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a species with an epilithic thallus consisting of pale grey to pale brown areolate to subsquamulose areoles, and 1-2 mm wide apothecia with brown, somewhat raised discs; usually on acidic schistose rocks . Known from Tuscany, but probably more widespread in Tyrrhenian Italy.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: extremely rare
Humid mediterranean belt: extremely rare
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
INDEX FUNGORUM GBIF DOLICHENS

Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall


Magnusson A. H. (1935) Acarosporaceae, Thelocarpaceae. - In: Rabenhorst G. L.: Kryptogamen-Flora von Deutschland, Österreich, und der Schweiz-. 2nd- IX. Die Flechten. Abt. 5- 1. Gebr. Borntraeger. Leipzig, pp. 1-318. – Public Domain


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/ Courtesy: Anita Stridvall


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_M/Texte_M/Myriospora_scabrida.htm
France, session AFL 2010 - Hérault