ITALIC 8.0

Acarospora cinerascens J. Steiner

in Arnold, Lich. Exs.: nr. 1500, 1890.

Synonyms: Acarospora alboatra H. Magn.

Distribution: N - TAA (Knudsen & al. 2015), VA (Piervittori & Isocrono 1999, Knudsen & al. 2015).

Description: Thallus crustose, episubstratic, areolate-subsquamulose, densely white-pruinose, the areoles 0.5-1(-2) mm wide, 0.3-0.6 mm thick, at first flat, then convex and fissured or reticulately grooved, dispersed or usually contiguous and separated by deep fissures, reddish brown, but almost always appearing white due to the thick layer of pruina, the margins most often dark. Epicortex to 30 µm thick, with small crystals dissolving in K; cortex 20-70 µm thick, brown in upper part, colourless in lower part, the cells mostly 3-4 µm wide; algal layer continuous, 100-150 µm thick; medulla white, to 0.4 µm thick, I-. Apothecia lecanorine, immersed, 0.3-1 mm across, with a black to brown-black, sometimes slightly pruinose disc and a thick, often radially fissured thalline margin. Proper exciple prosoplectenchymatous, widening around the disc to c. 30-50(-100) µm, sometimes distinct as a blackish ring around the disc, I-; epithecium brown, c. 10 µm high; hymenium colourless, 120-150 µm high, the hymenial gel hemiamyloid, I+ light blue fading to light red; paraphyses c. 1 µm thick at mid-level, the apical cells hardly swollen; subhymenium 30-50 µm high, I+ blue; hypothecium narrow, usually 10 µm high. Asci 100-200-spored, clavate, the apical dome K/I-, 100-130 x 20-25 µm. Ascospores 1-celled, hyaline, ellipsoid, 6-9(-12) x 2.5-3.5(-4) µm. Pycnidia immersed, dark. Conidia simple, ellipsoid, c. 2 x 1.5 µm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a species of the A. strigata-group (see Nurtai & al. 2017), growing on weathered base-rich siliceous rocks, restricted to dry-warm Alpine valleys with a continental climate. For further details see also Knudsen & al. (2015).

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Subcontinental: restricted to areas with a dry-subcontinental climate (e.g. dry Alpine valleys, parts of Mediterranean Italy)

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: very rare

Oromediterranean belt: absent

Montane belt: very rare

Submediterranean belt: extremely 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 DOLICHENS

From: Knudsen et al., Herziogia, 28, 2: 690-696, 2015 (Buschardt 420 - B) Scale: 0.5 mm

Modified from: https://gzu.jacq.org/GZU000277811

GZU000277811 - Leg. J. Poelt -1970-09-12 Location Italy / Trentino-Alto Adige Label Südtirol, Vintschgau: S-exponierte Felshänge E am Eingang in das Schlanderaunertal bei Schlanders ; Alt. 750 m - 800 m Habitat S-exponierte, steile Felshänge