Buellia abstracta (Nyl.) H. Olivier

Bull. Acad. Intern. Géogr. Bot., 12: 176, 1903. Basionym: Lecidea abstracta Nyl. - Flora, 66: 102, 1883.
Synonyms: Buellia sequax auct. non (Nyl.) Zahlbr.
Distribution: N - TAA (B-60 0195394).
Description: Thallus crustose, endosubstratic and indistinct to thinly episubstratic and poorly developed, with a I- medulla. Apothecia cryptolecanorine to lecideine, adnate to sessile, black, 0.2-0.6(-0.75) mm across, with a flat to slightly convex, epruinose or slightly pruinose disc, and a thin proper margin. Proper exciple dark brown to brown-black, N-, Aethalea-type; epithecium brown; hymenium colourless, not inspersed; paraphyses 3-5.5 µm thick at apex; hypothecium dark brown. Asci 8-spored, Bacidia-type. Ascospores 1-septate, pale brown, ellipsoid, straight, 9-13 x (3.5-)4-4.5(-6.8) µm, Buellia-type, thin-walled and not constricted at septum, smooth, but often becoming microrugulate when overmature, with ontogeny of type A. Pycnidia black. Conidia bacilliform, straight, 2.5-4 x c. 1 µm. Photobiont chlorococcoid. Spot tests: thallus K- or K+ yellow turning to red, C-, KC-, P-. Chemistry: no lichen substances or norstictic acid in thallus.
Note: a much misunderstood silicicolous species, in the past frequently confused with B. sequax (Giralt & al. 2011). The Italian sample, collected by Buschardt and identified by H. Sipman, was collected in Vinschgau - Val Venosta, on south-facing rocky slopes NE of Tartsch, at c. 1200 m.
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: extremely rare
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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Harrie Sipman – Source http://www.bgbm.fu-berlin.de/sipman/Zschackia/AegeanLichens/CaloplacaAC.htm - As Caloplaca oasis