ITALIC 8.0

Xanthoria steineri I.M. Lamb

J. Bot., 74: 350, 1936.

Synonyms:

Distribution: S - Si (Nimis & al. 1994).

Description: Thallus foliose, heteromerous, dorsiventral, forming regular, 1-3 cm wide rosettes, rather tightly adnate, lobed. Lobes concave to flattened, 0.5-2.5(-3) mm wide, yellow-orange to orange, smooth, somewhat wrinkled, crenate, shallowly subdivided, with slightly raised margins. Lower surface white to pale yellow, wrinkled, with short, white hapters. Upper cortex palisade parplectenchymatous; medulla white; lower cortex mesodermatous paraplectenchymatous. Apothecia common, lecanorine/zeorine, laminal, stipitate, up to 2 mm across, with an orange, smooth, concave to flat disc, and a smooth thalline margin. Epithecium yellow-brown, K+ purple-red; hymenium colourless, 50-75 µm high; paraphyses forked, the apical cells swollen; hypothecium colourless. Asci 8-spored, clavate, Teloschistes-type. Ascospores 2-celled, polarilocular, hyaline, ellipsoid, 10-13.5 x 5-7 µm, the equatorial thickening (“septum”) poorly developed, c. 1 µm (lumina appearing hourglass-shaped, in the form of two drops connected at their acute ends). Spot tests: thallus and apothecia K+ purple-red, C-, KC-, P-, UV+ intensely orange-red. Chemistry: unidentified anthraquinones, probably parietin (major), fallacinal, emodin, teloschistin and parietinic acid.

Note: a poorly known taxon of the X. parietina-complex, described from Iran, mostly occurring on bark near the coast in the Mediterranean region. The species, which needs further study, was included in the Italian red list of epiphytic lichens as “Data Deficient” (Nascimbene & al. 2013c).

Growth form: Foliose, broad lobed

Substrata: bark

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Poorly known taxon in need of further study

Taxon bound to maritime-coastal situations

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: absent

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 20873

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

Herbarium: TSB (20873)