Gyalidea roseola (Arnold) Lettau

Feddes Rep. Beih., 69: 123, 1937. Basionym: Gyalecta roseola Arnold - Verh. zool.-bot. Ges. Wien, 23: 95, 1873.
Synonyms:
Distribution: N - TAA (Nascimbene 2008b), Lig.
Description: Thallus crustose, episubstratic, very thin, continuous to finely rimose, pale yellowish brown. Apothecia lecideine, 0.4-0.7 mm across, with an initially concave, then almost flat, flesh-coloured to pinkish brown disc, and a smooth, more or less concolorous proper margin which is sometimes laterally covered by a very thin, finally excluded thalline layer. Poper exciple colourless, 50-70 µm wide laterally; hymenium colourless, 90-110 µm high; paraphyses mostly simple, 1-1.5 µm thick; hypothecium colourless. Asci 8-spored, thin-walled, apically thickened, with a small ocular chamber. Ascospores submuriform, with 3-7 transverse septa and 1-3 longitudinal septa, hyaline, narrowly ellipsoid to ovoid, 20-36 x 8-14 µm. Photobiont chlorococcoid, Cystococcus/Leptosira-like. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on siliceous rocks (especially crystalline schists), on periodically wetted faces, such as near creeks and waterfalls in upland areas; an overall rare species, known from a few localities in northwestern Europe and from the Alps; the record from Liguria needs confirmation.
Growth form: Crustose
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: extremely rare
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

Author: Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php



Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern



Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern



Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern



Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige, Bolzano/Bozen, Sciliar/Schlern