ITALIC 8.0

Scytinium leptogioides (Anzi) Otálora, P.M. Jørg. & Wedin

Fungal Divers., 64, 1: 290, 2013. Basionym: Collema leptogioides Anzi - Comm. Soc. Critt. Ital., 1, 3: 132, 1862.

Synonyms: Leptogium marcii Harm.

Distribution: N - Lig. C - Tosc.

Description: Thallus subcrustose-placodioid to minutely foliose, subgelatinous when wet, dark green to green-black, forming orbicular, up to 1 cm wide rosettes, the central parts often falling off in old specimens. Lobes linear or (usually) broader towards apices, flat to slightly convex, 80-215 μm thick when wet, radiating, contiguous, smooth, 0.2-0.5 mm wide, with entire margins and rounded apices, densely and finely pubescent on upper surface, especially on lobe-tips. Lower surface paler, attached by sparse whitish hapters. Pseudocortex usually present on both surfaces, of a single layer of isodiametrical, angular cells. Apothecia rather rare, lecanorine, sessile, 0.1-0.5 mm across, with a brown, concave to flat disc, a thin, smooth, often finely pubescent, finally often excluded thalline margin and a paler parathecial ring which is more evident in older apothecia. Thalline exciple usually pseudocorticate; proper exciple subparaplectenchymatous; epithecium brownish; hymenium colourless, 110-150 µm high, I+ blue; paraphyses mostly simple, 1.5-2 μm thick at mid-level, the apical cells slightly swollen; hypothecium colourless. Asci 8-spored, narrowly clavate to subcylindrical, the apex strongly thickened, the apical dome K/I+ pale blue, with a downwardly projecting K/I+ deep blue tubular structure. Ascospores submuriform to eumuriform, with 3-4(-5) transverse septa and 1-2(-3) longitudinal septa, hyaline, ellipsoid with acute ends, 15-28(-30) x 8.5-10(-12) μm. Pycnidia superficial or immersed, globose, pale with dark apex. Conidia bacilliform, slightly swollen at both ends, 4-6 x 1.5-2 μm. Photobiont cyanobacterial (Nostoc, the cells in short chains). Spot test: all negative. Chemistry: without lichen substances.

Note: a mainly Mediterranean species found on steeply inclined surfaces of calcareous rocks, often on cyanobacterial colonies, sometimes also on walls; to be looked for in Southern Italy.

Growth form: Foliose, narrow lobed

Substrata: rocks

Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)

Reproductive strategy: mainly sexual

On otherwise dry surfaces with short periods of water seepage after rain

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: extremely rare

Humid mediterranean belt: rare

Dry mediterranean belt: absent

pH of the substrata:

1

2

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4

5

(info)

Solar irradiation:

1

2

3

4

5

(info)

Aridity:

1

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3

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5

(info)

Eutrophication:

1

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3

4

5

(info)

Poleotolerance:

0

1

2

3

(info)

Altitudinal distribution:

1

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5

6

(info)

Predictive model

Index Fungorum GBIF

Matthia Schultz http://www.biodiversity-plants.de/fbca002/lichgalery.htm

Matthia Schultz - Source:http://www.biodiversity-plants.de/fbca002/lichgalery.htm