Bacidina vasakii (Vezda) Vězda

Folia Geobot. Phytotaxon., 25: 432, 1991. Basionym: Bacidia vasakii Vezda - Folia Geobot. Phytotaxon., 18: 64, 1983.
Synonyms: Woessia vasakii (Vězda) Sérus.
Distribution: S - Camp (Puntillo & al. 2000, Puntillo 2000), Bas (Puntillo & al. 2012), Cal (Puntillo 1995, 1996, 2000, Puntillo & Puntillo 2004).
Description: Thallus crustose, thinly episubstratic, ecorticate, grey-green, minutely granulose-coralloid, consisting of 50-65 μm wide, at first globose, then elongated goniocysts. Apothecia biatorine, constricted at base, 0.2-0.8 mm across, yellow-orange to orange-red, with a flat to convex, epruinose disc, and a weakly prominent, finally excluded proper margin. Proper exciple paraplectenchymatous, without crystals, of very thin-walled (0.5-1 μm), not distinctly radiating hyphae, mostly colourless. Epithecium colourless or pale green, indistinctly delimited from the hymenium, K-, N-; hyrnenium mostly colourless, 45-75 μm high; paraphyses mostly simple, 1-1.5 μm thick at mid-level, the apical cells clavate or only slightly thickened, up to 5 μm wide; hypothecium poorly developed, colourless to straw-coloured. Asci 8-spored, cylindrical-clavate, approaching the Bacidia-type, but the ocular chamber wider, and the axial body never penetrating through the entire d-layer, surrounded by a narrow, darker amyloid layer. Ascospores 3-7-septate, hyaline, needle-like, (30-)35-45(-50) x 0.8-1.5(-2) μm. Photobiont chlorococcoid, the cells 5-12(-14) μm in diam. Spot tests: thallus and apothecia K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a mild-temperate to humid pantropical species described from the Caucasus and also known from the Pyrenees, with granular to subcoralloid thallus, hemisphaerical whitish apothecia, and mostly 3-septate acicular ascospores, found in the understory of forests, mostly on twigs and leaves of Buxus. In Italy it is restricted to warm-humid situations and undisturbed stands of the Tyrrhenian region, mostly in the Mediterranean belt. The species is included in the Italian red list of epiphytic lichens as “Endangered” (Nascimbene & al. 2013c), but it is easy to overlook and it could be somehow more widespread.
Growth form: Crustose
Substrata: leaves
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)
Restricted to humid-warm, oceanic areas

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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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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P.L. Nimis CC BY-SA 4.0
TSB 9047



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (30803)
2001/12/12



P.L. Nimis CC BY-SA 4.0
TSB 9047