Gyalecta thelotremella Bagl.

N. Giorn. Bot. Ital., 11: 87, 1879.
Synonyms: Petractis thelotremella (Bagl.) Vězda
Distribution: C - Tosc, Sar (Alonso & Egea 1994). S - Camp (Nimis & Tretiach 2004, Garofalo & al. 2010), Pugl (Nimis & Tretiach 1999), Cal (Puntillo 1996), Si (Alonso & Egea 1994, Nimis & al. 1994).
Description: Thallus crustose, thinly episubstratic or partly endosubstratic, 100-400 µm thick, continuous to finely rimose, pinkish white to yellowish white. Apothecia 0.2-0.3 mm across, immersed in the thallus and partly in the rock, at first covered with a thin thalline layer which soon disrupts leaving a kind of false thalline margin, appearing perithecioid when young, the disc later expanded, concave, pale yellow to flesh-coloured, smooth, surrounded by a thin, whitish proper margin. Proper exciple to 40 μm thick in upper part, colourless, often with crystals of calcium oxalates; epithecium colourless; hymenium colourless, 130-180 μm high; paraphyses 1.2-1.5 μm thick at mid-level, the apical cells hardly swollen; hypothecium colourless, c. 20 μm high. Asci 8-spored, thin-walled, lacking an apical apparatus or tholus, K/I+ blue. Ascospores muriform with 3-5 transverse septa and 1-3 longitudinal septa, ellipsoid to broadly ovoid, 14-25 x 7-12 μm, not halonate. Pycnidia completely immersed in the thallus. Conidia bacilliform, straight, 6-7 x c. 1 μm. Photobiont trentepohlioid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on compact calcareous rocks in sheltered situations, often found together with Petractis luetkemuelleri, mostly Tyrrhenian, but also present in Puglia, where it is not rare along the rocky coasts.
Growth form: Crustose
Substrata: rocks
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
Taxon bound to maritime-coastal situations

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: rather rare
Dry mediterranean belt: very rare

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 04
TSB 15955



P.L. Nimis CC BY-SA 04
TSB 38311



P.L. Nimis CC BY-SA 04
TSB 15955


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_G/Textes_G1/Gyalecta_thelotremella.htm
France, session AFL 2015 dans le Lot, Blanzaguet


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_G/Textes_G1/Gyalecta_thelotremella.htm
France, session AFL 2015 dans le Lot, Blanzaguet


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_G/Textes_G1/Gyalecta_thelotremella.htm
France, session AFL 2015 dans le Lot, Blanzaguet


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_G/Textes_G1/Gyalecta_thelotremella.htm
France, session AFL 2015 dans le Lot, Blanzaguet