Lobothallia hydrocharis (Poelt & Nimis) Sohrabi & Nimis

in Nimis, The Lichens of Italy. A second annotated catalogue: 19, 2016. Basionym: Aspicilia hydrocharis Poelt & Nimis - in Nimis & Poelt, Studia Geobot., 7, suppl. 1: 44, 1987.
Synonyms:
Distribution: C - Sar (Ravera & Nascimbene 2015).
Description: Thallus crustose-placodioid, episubstratic, dark lead-grey to bluish-gray, thick, areolate in central parts, distinctly lobed at margins, forming orbicular rosettes, with distinctly flattened areoles and lobes, the lobes contiguous, separated by longitudinal cracks and then divided, 2-4 x 1-1.5 mm, with sharp margins. Areoles more or less polygonal, with sharp edges, the apothecia-bearing ones often somewhat thicker than the others. Thallus with a paraplectenchymatous structure; medulla white, I-; algal layer very irregular, with relatively small algae. Apothecia aspicilioid, 1-6 per areole, completely immersed and immarginate, or more rarely with an indistinct black exciple, 0.5-1 mm across, with a rounded to irregular, black, epruinose, concave to flat disc. Proper exciple paraplectenchymatous in outer part; epithecium violet-brown, K+ reddish brown; hymenium colourless, c. 100 μm high; paraphyses submoniliform at least in upper part; hypothecium colourless, of roundish, small but distinct cells, subtended by a usually discontinuous algal layer. Asci 6-8-spored, oblong-clavate, the thin outer coat K/I+ blue, the wall and apical dome K/I-. Ascospores, 1-celled, hyaline, mostly ovoid, 10-12.5 x 5-8 μm. Pycnidia black, immersed, with a colourless wall except in the dark periostiolar region. Conidia bacilliform, straight, c. 5-10 x c. 0.7 μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC- P-, UV-. Chemistry: without lichen substances.
Note: a very characteristic species known only from Sardinia, where it appears to be quite widespread (Ravera & Nascimbene 2015) on periodically submerged basaltic rocks in creeks that are dry during summer.
Growth form: Crustose placodiomorph
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Periodically submerged (e.g. in creeks)

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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Predictive model
Herbarium samples


P.L. Nimis CC BY-SA 4.0
TSB 10464



Felix Schumm; Owner: CC BY-SA 4.0
[TSB 10464], Italy, Sardinia, Prov. Nuoro, Catena del Marghine below Punta Palai, c. 920 m, on schist in a rivulet which is dry in summer. 18.07.1987, Leg. M. Codogno, M. Tretiach, J. Poelt & A. Vezda. - VEZDA LICHENES SELECTI EXSICCATI 2217



Felix Schumm; Owner: CC BY-SA 4.0
[TSB 10464], Italy, Sardinia, Prov. Nuoro, Catena del Marghine below Punta Palai, c. 920 m, on schist in a rivulet which is dry in summer. 18.07.1987, Leg. M. Codogno, M. Tretiach, J. Poelt & A. Vezda. - VEZDA LICHENES SELECTI EXSICCATI 2217



Juri Nascimbene - CC BY-SA 4.0; Owner: ITALIC - Dyades Project - Dept. of Life Sciences, University of Trieste
Sardinia, Italy
2014



Juri Nascimbene - CC BY-SA 4.0; Owner: ITALIC - Dyades Project - Dept. of Life Sciences, University of Trieste
Sardinia, Italy
2014



Felix Schumm - CC BY-SA 4.0
[TSB 10464], Italy, Sardinia, Prov. Nuoro, Catena del Marghine below Punta Palai, c. 920 m, on schist in a rivulet which is dry in summer. 18.07.1987, Leg. M. Codogno, M. Tretiach, J. Poelt & A. Vezda. - VEZDA LICHENES SELECTI EXSICCATI 2217



Felix Schumm - CC BY-SA 4.0
[TSB 10464], Italy, Sardinia, Prov. Nuoro, Catena del Marghine below Punta Palai, c. 920 m, on schist in a rivulet which is dry in summer. 18.07.1987, Leg. M. Codogno, M. Tretiach, J. Poelt & A. Vezda. - VEZDA LICHENES SELECTI EXSICCATI 2217



Felix Schumm - CC BY-SA 4.0
[TSB 10464], Italy, Sardinia, Prov. Nuoro, Catena del Marghine below Punta Palai, c. 920 m, on schist in a rivulet which is dry in summer. 18.07.1987, Leg. M. Codogno, M. Tretiach, J. Poelt & A. Vezda. - VEZDA LICHENES SELECTI EXSICCATI 2217



Felix Schumm - CC BY-SA 4.0
[TSB 10464], Italy, Sardinia, Prov. Nuoro, Catena del Marghine below Punta Palai, c. 920 m, on schist in a rivulet which is dry in summer. 18.07.1987, Leg. M. Codogno, M. Tretiach, J. Poelt & A. Vezda. - VEZDA LICHENES SELECTI EXSICCATI 2217



Felix Schumm - CC BY-SA 4.0
[TSB 10464], Italy, Sardinia, Prov. Nuoro, Catena del Marghine below Punta Palai, c. 920 m, on schist in a rivulet which is dry in summer. 18.07.1987, Leg. M. Codogno, M. Tretiach, J. Poelt & A. Vezda. - VEZDA LICHENES SELECTI EXSICCATI 2217



Felix Schumm - CC BY-SA 4.0
[TSB 10464], Italy, Sardinia, Prov. Nuoro, Catena del Marghine below Punta Palai, c. 920 m, on schist in a rivulet which is dry in summer. 18.07.1987, Leg. M. Codogno, M. Tretiach, J. Poelt & A. Vezda. - VEZDA LICHENES SELECTI EXSICCATI 2217



Felix Schumm - CC BY-SA 4.0
[TSB 10464], Italy, Sardinia, Prov. Nuoro, Catena del Marghine below Punta Palai, c. 920 m, on schist in a rivulet which is dry in summer. 18.07.1987, Leg. M. Codogno, M. Tretiach, J. Poelt & A. Vezda. - VEZDA LICHENES SELECTI EXSICCATI 2217



Felix Schumm - CC BY-SA 4.0
[TSB 10464], Italy, Sardinia, Prov. Nuoro, Catena del Marghine below Punta Palai, c. 920 m, on schist in a rivulet which is dry in summer. 18.07.1987, Leg. M. Codogno, M. Tretiach, J. Poelt & A. Vezda. - VEZDA LICHENES SELECTI EXSICCATI 2217



Felix Schumm; Owner: CC BY-SA 4.0
[TSB 10464], Italy, Sardinia, Prov. Nuoro, Catena del Marghine below Punta Palai, c. 920 m, on schist in a rivulet which is dry in summer. 18.07.1987, Leg. M. Codogno, M. Tretiach, J. Poelt & A. Vezda. - VEZDA LICHENES SELECTI EXSICCATI 2217



P.L. Nimis CC BY-SA 4.0
TSB 10464