Thelidium dionantense (Hue) Zschacke

Hedwigia, 62: 130, 1920. Basionym: Verrucaria dionantensis Hue in Tonglet - Bull. Soc. Bot. Belgique, 37: 41, 1898.
Synonyms:
Distribution: N - Ven (Nascimbene & al. 2021). C - Abr (Nimis & Tretiach 1999, Gheza & al. 2021).
Description: Thallus crustose, thinly episubstratic, pale grey-green to whitish, rugose, with an oily appearance, often with scattered black dots. Perithecia black, 0.3-0.6 mm across, immersed in thalline warts and basally also in the rock. Involucrellum absent; exciple black-brown in upper part, colourless in lower part; hamathecium of periphyses and periphysoids, interascal filaments absent; hymenial gel I+ red (I+ blue at very low concentrations of I), K/I+ blue. Asci 8-spored, ellipsoid to clavate, I-, fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of a delicate rostrum. Ascospores 1-septate, hyaline, ellipsoid, 22-36 x 11-15 µm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on steeply inclined surfaces of calciferous rocks in upland areas, with several scattered records throughout the Alps, known also from the Central Apennines.
Growth form: Crustose endolithic
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: rare
Subalpine belt: very rare
Oromediterranean belt: absent
Montane belt: very 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
Index Fungorum GBIF


J. Nascimbene CC BY-SA 4.0
Italy, Veneto



Juri Nascimbene CC BY-SA 4.0
Italy, Veneto



Juri Nascimbene CC BY-SA 4.0
Italy, Veneto



Juri Nascimbene CC BY-SA 4.0
Italy, Veneto


S. Poumarat - Source: http://mycologie.catalogne.free.fr/lichens.htm



Juri Nascimbene CC BY-SA 4.0
Italy, Veneto



Juri Nascimbene CC BY-SA 4.0
Italy, Veneto



Juri Nascimbene CC BY-SA 4.0
Italy, Veneto



Juri Nascimbene CC BY-SA 4.0
Italy, Veneto



Juri Nascimbene CC BY-SA 4.0
Italy, Veneto



Juri Nascimbene CC BY-SA 4.0
Italy, Veneto