ITALIC 7.0

Psora gresinonis B. de Lesd.

Bull. Soc. Bot. France, 77: 614, 1930.

Synonyms: Lecidea gresinonis (B. de Lesd.) Zahlbr.

Distribution: N - Lig. C - Sar. S - Cal (Puntillo 1996).

Description: Thallus of greenish brown, (2-)3-6 mm wide, crenate, ascending, contiguous to imbricate squamules. Upper surface finely divided by small fissures; lower surface whitish. Apothecia biatorine, sessile, up to 5 mm across, with a dark brown to black, convex disc and a thin, mostly indistinct and soon excluded proper margin. Epithecium reddish brown, K+ red; hymenium colourless, I+ blue; paraphyses anastomosing, conglutinated; hypothecium dark brown.Asci 8-spored, elongate-clavate, with a thin, outer amyloid layer and a thickened tholus penetrated by a tube, the sides of which stain I/KI+ deep blue, without an ocular chamber, Porpidia-type. Ascospores 1-celled, hyaline, ellipsoid, thin-walled, 12-15 x 6-8 µm. Photobiont chlorococcoid. Spot tests: thallus and medulla K-, C-, KC-, P-, UV-. Chemistry: thallus without lichen substances; epithecium with anthraquinones.

Note: on soil, in fissures of base-rich or slightly calciferous siliceous rocks, with optimum in dry grasslands at relatively low elevations; chemically heterogeneous (with and without norstictic acid), with a mainly Tyrrhenian range in Italy.

Growth form: Squamulose

Substrata: soil, terricolous mosses, and plant debris

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: extremely rare

Padanian area: absent

Humid submediterranean belt: very rare

Humid mediterranean belt: very rare

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

Herbarium samples

Index Fungorum GBIF

P.L. Nimis CC BY-SA 04

TSB 10088

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (10088)
2001/11/29