ITALIC 8.0

Buellia asterella Poelt & Sulzer

Nova Hedwigia, 25: 182, 1974.

Synonyms:

Distribution: C - Laz (Trinkaus & Mayrhofer 2000).

Description: Thallus crustose-placodioid, white, with radiating marginal lobes, forming c. 2 cm wide, orbicular rosettes, the lobes 0.3-0.5 mm broad, 5-8 mm long, elongate, flattened to weakly convex, strongly white-farinose-pruinose. Phenocortex up to 75 µm thick, filled with crystals; medulla white, filled with crystals of oxalates. Apothecia frequent, lecideine, sessile, (0.1-)0.4-0.8(-1.2) mm across, with a black, flat to slightly convex, sometimes pruinose disc, and a thin, smooth, finally excluded proper margin. Proper exciple up to 60 µm wide laterally, of more or less radiating hyphae, pale brown throughout, or paler in inner part; epithecium yellowish brown, 10-15 µm high; hymenium colourless. 50-70(-80) µm high; paraphyses 2.5-3.5 µm thick at mid-level, the apical cells 3.5-5 µm wide, with a dark cap; hypothecium pale to medium brown, up to 100 µm high. Asci 4-spored, clavate to cylindrical-clavate, the apical dome K/I+ dark blue with a pale, conical-pointed apical cushion (axial mass), the wall I-, but the thin outer gel I+ blue, Bacidia-type. Ascospores 1-septate, slightly constricted at septum, pigmented, ellipsoid, (10-)11-16(-19) x (4.5-)5-8(-8.5) µm, Buellia-type, with a microfoveate ornamentation. Pycnidia rare, dark, immersed. Conidia bacilliform, 5-8 x 1-2 µm. Photobiont chlorococcoid. Spot tests: thallus K+ yellow turning red (very rarely K-), C-, KC-, P+ yellow-orange or very rarely P-. Chemistry: atranorin and variable amounts of norstictic acid.

Note: a mainly western European species growing on calciferous or gypsaceous soil in dry grasslands. According to Spribille & Wagner (2016), it is presently extinct over much of its former range: the only verifiable extant populations at present are in the Vågå region of Norway, where only two of three historical sites have been confirmed, and even these are in sharp decline.

Growth form: Crustose placodiomorph

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: extremely 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

P.L. Nimis CC BY-SA 04

GZU Herb.Hafellner 2972

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

Herbarium: GZU Herb.Hafellner (2972)
2003/04/28

P.L. Nimis CC BY-SA 04

GZU Herb.Hafellner (2972)