Leptogium byssinum (Hoffm.) Nyl.

Zwackh ex Nyl., Act. Soc. linn. Bordeaux, 21: 270, 1856. Basionym: Collema byssinum Hoffm. - Deutschl. Fl., 2: 105, 1796.
Synonyms: Collema cheileum var. byssinum (Hoffm.) Körb.; Epiphloea byssina (Hoffm.) Henssen & P.M. Jørg.; Leptogium amphineum Ach. ex Nyl.; Polychidium byssinum (Hoffm.) Trevis.
Distribution: N - TAA, Lomb (Nascimbene & al. 2021).
Description: Thallus crustose, blue-grey to brown-black, gelatinous when wet, thin, areolate-granulose, 0.5-5 mm wide. Areoles up to 3 mm wide, densely granulose, contiguous, paraplectenchymatous throughout. Apothecia frequent, lecanorine, rounded, semi-immersed in the thallus granules or adnate, 0.4-0.8(-1.5) mm across, with a brown, at first concave, then flat disc, a thick, smooth to granulose thalline margin, and a thin proper margin which is visible at least in section. Epithecium very pale brown; hymenium and hypothecium colourless; paraphyses conglutinate, mostly simple, the apices swollen. Asci (4-)8-spored, narrowly clavate, the wall K/I+ blue, the apical dome pale blue with a dark blue axial tube. Ascospores submuriform, usually with 1 transverse septum, hyaline, ellipsoid, (14-)18-28(-33) x 7-15 μm. Photobiont cyanobacterial (Nostoc, in short chains). Spot tests: all negative. Chemistry: without lichen substances.
Note: an inconspicuous, perhaps overlooked, ephemeral lichen of calciferous-clayey soil.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly sexual
Pioneer species

Commonnes-rarity: (info)

Alpine belt: extremely rare
Subalpine belt: very rare
Oromediterranean belt: absent
Montane belt: very rare
Submediterranean belt: very rare
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

Arizona State University Lichen Herbarium (ASU) – CC-BY-SA-NC


Arizona State University Lichen Herbarium (ASU) – CC-BY-SA-NC


Arizona State University Lichen Herbarium (ASU) – CC-BY-SA-NC


Arizona State University Lichen Herbarium (ASU) – CC-BY-SA-NC