Thelidium minimum (Körb.) Arnold

Verh. zool.-bot. Ges. Wien, 21: 1132, 1871. Basionym: Verrucaria minima A. Massal. ex Körb. - Parerga Lichenol., 4: 380, 1863.
Synonyms:
Distribution: N - TAA.
Description: Thallus crustose, very thinly episubstratic, continuous to slightly cracked, grey, grey-green or brown, often forming small flecks. Perithecia black, subglobose, 0.1-0.15(-0.2) mm across, hemispherically projecting. Involucrellum apical, covering the upper third or half of perithecium; exciple pale, except for the dark apex; 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, narrowly ellipsoid to clavate, I fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of a delicate rostrum. Ascospores (0-)1-septate, hyaline, ellipsoid to ovoid, (8-)10-17 x 3-6(-7) μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on calcareous pebbles, or on rock surfaces close to the ground in upland areas.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: very 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

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_T/Textes_T2/Thelidium_minimum.htm
France, 5/5/2018 - Poleymieux-au-Mont-d’Or - Rhône


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_T/Textes_T2/Thelidium_minimum.htm
France, 5/5/2018 - Poleymieux-au-Mont-d’Or - Rhône


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_T/Textes_T2/Thelidium_minimum.htm
France, 5/5/2018 - Poleymieux-au-Mont-d’Or - Rhône


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_T/Textes_T2/Thelidium_minimum.htm
France, 5/5/2018 - Poleymieux-au-Mont-d’Or - Rhône


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_T/Textes_T2/Thelidium_minimum.htm
France, 5/5/2018 - Poleymieux-au-Mont-d’Or - Rhône


Source: Zschacke, H. (1934) Epigloeaceae, Verrucariaceae und Dermatocarpaceae. In: Dr. L. Rabenhorst‘s Kryptogamen-Flora, Band 9, Abt. 1, Teil 1. Akademische Verlagsgesellschaft, Leipzig, 695 pp. - Public Domain