Scytinium gelatinosum (With.) Otálora, P.M. Jørg. & Wedin

Fungal Divers. (online version), 64: 290, 2013. Basionym: Lichen gelatinosus With. - Bot. Arrang. Veget. Gr. Brit.: 710, 1776.
Synonyms: Collema scotinum (Ach.) Ach.; Leptogium gelatinosum (With.) J.R. Laundon; Leptogium scotinum (Ach.) Fr.; Leptogium scotinum var. sinuatum (Huds.) Torss.; Leptogium sinuatum (Huds.) A. Massal.
Distribution: N - Frl, Ven (Nascimbene & Caniglia 2003c), TAA (Nascimbene & al. 2022), Lomb (Gheza & al. 2023), Piem (Isocrono & al. 2004), VA (Matteucci & al. 2013), Emil (Nimis & al. 1996, Fariselli & al. 2020), Lig (Otálora & al. 2008). C - Tosc (Brackel 2015), Marc (Nimis & Tretiach 1999), Umb (Genovesi & al. 2001, Ravera & al. 2006), Laz, Abr (Nimis & Tretiach 1999, Gheza & al. 2021), Mol (Nimis & Tretiach, 1999, 2004, Caporale & al. 2008), Sar (Zedda 2002). S - Camp (Nimis & Tretiach 2004), Pugl (Nimis & Tretiach 1999), Bas (Nimis & Tretiach 1999, Potenza 2006), Cal (Puntillo 1996), Si (Ottonello & al. 1994, Nimis & al. 1996b, Ottonello 1996).
Description: Thallus small-foliose to squamulose, slightly gelatinous when wet, brown to dark brown, often paler bluish grey in the basal, less exposed parts, somehow shiny, loosely attached, forming compact 2.5-4.5(-8) cm wide tufts. Lobes (1-)3-4(-5) mm broad, up to 1.5 cm long, 60-135 µm thick, ascending to erect, often imbricate, wrinkled, with entire to irregularly and shallowly crenate margins; lower surface paler, with scattered, whitish hapters. Upper and lower cortex of a single layer of angular, more or less isodiametrical cells, the layer inbetween of intertwined hyphae and loosely arranged chains of Nostoc. Apothecia rather common, lecanorine, adnate to sessile, strongly constricted at base, up to 2 mm across, with a brown, concave to flat, smooth disc and a thick, sometimes concentrically wrinkled thalline margin. Proper exciple euparaplectenchymatous, 10-35 µm wide laterally; epithecium pale brown; hymenium colourless, 115-170 µm high; paraphyses coherent, mostly simple, c. 1 µm thick at mid-level, the apical cells slightly swollen; hypothecium yellowish to pale brown, 10-50 µm high. Asci 8-spored, cylindrical-clavate, the apex strongly thickened, the apical dome K/I+ pale blue, with a downwardly projecting K/I+ deep blue tubular structure. Ascospores submuriform to muriform, with 5-7(-9) transverse septa and 1-2 longitudinal septa, hyaline, broadly ellipsoid to subfusiform, thin-walled, (22-)25-35(-45) x (11-)12-14(-18) µm. Photobiont cyanobacterial (Nostoc, the cells in long chains). Spot tests: all negative. Chemistry: without lichen substances.
Note: a widespread holarctic lichen, most common on base-rich siliceous substrata, especially in open grasslands, well distinguished from the more calcicolous S. lichenoides.
Growth form: Squamulose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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

pH of the substrata:

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Solar irradiation:

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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


P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (11701)
2001/11/26



Pier Luigi Nimis CC BY-SA 4.0
TSB 41636



Pier Luigi Nimis CC BY-SA 4.0
TSB 41636



Pier Luigi Nimis CC BY-SA 4.0
TSB 41636


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Scytinium_gelatinosum.htm
France, session AFL 2015 - Lot


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Scytinium_gelatinosum.htm
France, session AFL 2015 - Lot


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Scytinium_gelatinosum.htm
France, session AFL 2015 - Lot


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Scytinium_gelatinosum.htm
France, session AFL 2015 - Lot


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Scytinium_gelatinosum.htm
France, session AFL 2015 - Lot


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=341&lang=en
France, Aber, Four à chaux


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=341&lang=en
France, Aber, Four à chaux


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=341&lang=en
France, La Palue


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=341&lang=en
France, La Palue


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=341&lang=en
France, La Palue


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=341&lang=en
France, La Palue


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=341&lang=en
France, La Palue


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=341&lang=en
France, Aber, Four à chaux