ITALIC 8.0

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, the single areoles up to 3 mm wide, to 150 µm thick, densely granulose, contiguous, attached by pale rhizohyphae, paraplectenchymatous throughout in central parts, the upper and lower cortex poorly developed or partly composed of a single row of isodiametric cells. Apothecia frequent, lecanorine, rounded, semi-immersed in the thallus granules or adnate, 0.5-1.5(-2) mm across, with a brown, at first concave, then flat disc, a thick, smooth to granulose, finally sometimes excluded thalline margin, and a thin proper margin which is visible at least in section. Proper exciple thin, of elongated cells; epithecium very pale brown; hymenium colourless, (90-)100-120(-150) μm high, K/I+ blue; paraphyses coherent, mostly simple, 1-2 μm thick at mid-level, the apical cells slightly swollen; hypothecium colourless. 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-)16-30(-33) x (7-)8-12(-15) µm. Photobiont cyanobacterial (Nostoc, the cells in clusters or 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:

1

2

3

4

5

(info)

Solar irradiation:

1

2

3

4

5

(info)

Aridity:

1

2

3

4

5

(info)

Eutrophication:

1

2

3

4

5

(info)

Poleotolerance:

0

1

2

3

(info)

Altitudinal distribution:

1

2

3

4

5

6

(info)

Predictive model

Index Fungorum GBIF

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