Scytinium intermedium (Arnold) Otálora, P.M. Jørg. & Wedin

Fungal Divers., 64, 1: 290, 2013. Basionym: Leptogium minutissimum var. intermedium Arnold - Flora, 50: 122, 1867.
Synonyms: Leptogium intermedium (Arnold) Arnold; Leptogium minutissimum auct. non (Flörke) Fr.
Distribution: N - Frl (TSB 15419), Ven (Thor & Nascimbene 2007), TAA (Nascimbene & al. 2007b), Lomb (Jørgensen 1994, Otálora & al. 2008), Piem (Isocrono & al. 2004, Otálora & al. 2008). C - Tosc (Otálora & al. 2008), Umb (Ravera & al. 2006, 2006b), Laz (Herb. Ravera 4886), Sar. S - Camp, Si.
Description: Thallus squamulose, slightly gelatinous when wet, bluish grey to dark brown, often paler in the basal, less exposed parts, 50-100 µm thick, loosely attached, forming up to 3 cm wide colonies. Squamules smooth to slightly wrinkled, (0.2-)0.5-1 mm broad, elongate, ascending, contiguous to imbricate, with a usually down-turned, entire or shallowly incised margin; lower surface paler blue-grey, with scattered tufts of white 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 lecanorine, sessile, strongly constricted at base, up to 0.5 mm across, with a brown, concave, smooth disc and a thick thalline margin. Proper exciple euparaplectenchymatous; epithecium pale brown; hymenium and hypothecium colourless; paraphyses coherent, mostly simple, the apices slightly swollen. Asci 8-spored, narrowly clavate, the apex strongly thickened, the apical dome K/I+ pale blue, with a downwardly projecting K/I+ deep blue tubular structure. Ascospores submuriform, hyaline, broadly ellipsoid, 20-35 x 8-13 µm. Photobiont cyanobacterial (Nostoc, the cells in short chains). Spot tests: all negative. Chemistry: without lichen substances.
Note: a mainly temperate species found on soil, occasionally on the mossy bases of ancient trunks, more rarely on calcareous rocks.
Growth form: Squamulose
Substrata: bark, soil, terricolous mosses, and plant debris
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: extremely rare
Oromediterranean belt: absent
Montane belt: extremely rare
Submediterranean belt: very rare
Padanian area: absent
Humid submediterranean belt: very rare
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
Herbarium samples
Index Fungorum GBIF


P.L. Nimis CC BY-SA 04
TSB 41638



Curtis Randall Björk – CC BY-SA 4.0
British Columbia, Cariboo Region, Marble Range Date: 2014-06-04 Terricolous on limestone ridge



Pier Luigi Nimis CC BY-SA 4.0
TSB 41638



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (17844)
2003/03/06



Pier Luigi Nimis CC BY-SA 4.0
TSB 41638