ITALIC 8.0

Porpidia superba (Körb.) Hertel & Knoph

in Hertel, Beih. Nova Hedwigia, 79: 438, 1984. Basionym: Lecidea superba Körb. - Syst. Lich. Germ.: 248, 1855.

Synonyms: Huilia superba (Körb.) Hertel; Lecidea incrassata H. Magn.; Lecidea macrocarpa var. superba (Körb.) Th. Fr.

Distribution: N - TAA (Nascimbene & al. 2022), Piem (Isocrono & al. 2004).

Description: Thallus crustose, episubstratic, bullate-areolate, the areoles usually convex, often well-separated from each other, chalky white, more rarely creamy white or very pale grey, scabrid, rarely delimited by a black prothallus. Soredia sometimes present, formed in the cracks of the thallus, granular, concolorous with the thallus. Medulla white, I-. Apothecia lecideine, at first immersed at margins of areoles, later sessile, 0.5-1.5(-2) mm across, with a brown to black-brown, red-brown when wet, sometimes (especially when young) white-pruinose, flat to finally slightly convex disc and an epruinose, rather thick, undulate, black proper margin. Proper exciple thick, dark brown throughout (a paler inner area visible on very thin sections only), of radiating hyphae; epithecium brownish to orange-brown, c. 20 µm high, N+ orange, K-; hymenium colourless, 90-150 μm high; paraphyses strongly coherent, branched in upper part and richly anastomosing, 1.5-2 µm thick at mid-level, the apical cell to 4 µm wide; hypothecium thick, brown-black. Asci 8-spored, elongate-clavate, with a thin, outer amyloid layer and a thickened tholus penetrated by a pore, the sides of which are strongly amyloid, Porpidia-type. Ascospores 1-celled, hyaline, ellipsoid to ovoid, (16-)19-28(-33) x (6-)8-12(-14) μm, thin-walled, halonate when young. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-; medulla sometimes K+ yellow, P+ orange-yellow. Chemistry: without lichen substances, or medulla with stictic acid (usually in low amounts, or in traces).

Note: a mainly arctic-alpine lichen found on weakly calciferous or basic siliceous rocks in sheltered situations near or above treeline. An earlier record from Emilia (see Nimis 1993: 570), being dubious, is not accepted here.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: very rare

Subalpine belt: very rare

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: absent

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

Herbarium samples

INDEX FUNGORUM GBIF DOLICHENS

P.L. Nimis CC BY-SA 4.0

TSB 27853

Pier Luigi Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (27853)