Staurothele caesia (Arnold) Arnold

Flecht. Frank. Jura: 246, 1885. Basionym: Polyblastia caesia Arnold - Flora, 41: 251, 1858.
Synonyms: Verrucaria caesia f. saprophila (Arnold) Stizenb.
Distribution: N - Ven, TAA.
Description: Thallus endosubstratic to (rarely) thinly episubstratic and forming minute specks, pale grey to brownish grey, sometimes separated from adjacent thalli by dark prothalline lines. Perithecia black, without involucrellum, immersed in pits in the rock, (0.3-)0.4-0.5(-0.7) mm across. Exciple dark throughout; hymenial gel I+ red (I+ blue at very low concentrations of iodine), K/I+ blue; hymenial algae isodiametric to shortly oblong, 1-2 times as long as wide, 2.5-5 x 2.5-3.5 μm; hamathecium of periphyses and periphysoids, interascal filaments absent. Asci 8-spored, clavate, the wall thickened above, with an ocular chamber, after dehiscence with a delicate extruded endotunica, I-, K/I-. Ascospores muriform, hyaline to yellow-brown at maturity, ellipsoid, (25-)30-40(-48) x 15-23(-28) μm. Photobiont chlorococcoid, present in both thallus and hymenium. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on limestone and dolomite in exposed situations in upland areas, but usually not reaching the Alpine belt.
Growth form: Crustose endolithic
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: extremely 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
Index Fungorum GBIF

Harrie Sipman – Source http://www.bgbm.fu-berlin.de/sipman/Zschackia/AegeanLichens/CaloplacaAC.htm - As Caloplaca oasis


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


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Staurothele_caesia.htm
France, 25/5/2015 - session AFL dans le Lot - Saint-Sozy


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Staurothele_caesia.htm
France, 25/5/2015 - session AFL dans le Lot - Saint-Sozy


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Staurothele_caesia.htm
France, 25/5/2015 - session AFL dans le Lot - Saint-Sozy


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Staurothele_caesia.htm
France, 25/5/2015 - session AFL dans le Lot - Saint-Sozy