ITALIC 8.0

Physconia subpulverulenta (Szatala) Poelt var. atlantica Poelt

Nova Hedwigia, 12: 127, 1966.

Synonyms:

Distribution: C - Sar (Zedda 1995, 2002, Zedda & Sipman 2001).

Description: Thallus foliose, heteromerous, dorsiventral, narrow-lobed, rather tightly adpressed, forming up to 6 cm wide rosettes. Lobes elongate, 0.5-1(-1.3) mm wide, rather thin, flat to concave, of variable colour, from brown in weakly pruinose forms to white in strongly pruinose ones, with a coarse white pruina at least at tips, with numerous, cylindrical to slightly flattened, mostly marginal isidia-like outgrowths. Lower surface mostly black (whitish in marginal parts), with dense, dark, squarrose rhizines. Upper and lower cortex prosoplectenchymatous, the hyphae mostly running perpendicularly to the surface; medulla yellowish. Apothecia lecanorine, sessile, to 3 mm across, with a usually white-pruinose disc and a persistent, often lobulate thalline margin, the lobules usually isidiate. Epithecium brown; hymenium and hypothecium colourless; paraphyses slender, simple or forked in upper part, the apical cells clavate, with a thin, dark brown cap. Asci 8-spored, clavate, the K/I+ blue tholus penetrated by a faintly amyloid apical cushion with parallel or diverging flanks, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores 1-septate, brown, ellipsoid, 24-30 x 12-18 μm, thickened at septum but not at apices, Physconia-type. Photobiont chlorococcoid. Spot tests: upper cortex K-, C-, KC-, P-; medulla K+ yellow, C+ yellow, KC+ yellow-orange, P-. Chemistry: medulla with variolaric acid.

Note: a critical taxon, which needs further study. It was included in the Italian red list of epiphytic lichens as “Data Deficient” (Nascimbene & al. 2013c).

Growth form: Foliose, narrow lobed

Substrata: bark

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: extremely rare

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

P.L. Nimis CC BY-SA 04

TSB 8136

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

Herbarium: TSB (8136)

Wolfgang von Brackel - CC BY-4.0

Italy, Sardegna