ITALIC 8.0

Xanthoria stiligera Giralt, Nimis & Poelt

J. Hattori Bot. Lab., 74: 281, 1993.

Synonyms:

Distribution: S - Camp (Garofalo & al. 1999), Pugl.

Description: Thallus foliose, heteroemrous, dorsiventral, closely adpressed, orange to orange-red, forming regular to irregular, often confluent, 2(-3) cm wide rosettes. Lobes 0.5-1(-2) mm wide, mostly convex, but often flattened at the ends, with numerous, at first papilliform, later clavate to cylindrical, prostrate to erect, simple or sparingly branched, 0.05-0.08(-0.1) mm thick isidia; lower surface white or pale yellow, concave, folded, with numerous, mostly marginal, whitish hapters. Upper and lower cortices paraplectenchymatous; medulla white, rather loose, the hyphae 3-4 µm thick, often running parallel to the substrate. Apothecia rare, lecanorine/zeorine, to 2.5 mm across, strongly constricted at base, with a concave to flat, dark orange (usually darker than thallus) disc, and a thin, continuous, often isidiate and sometimes finally excluded thalline margin. Thalline exciple 100-200 µm wide laterally; proper exciple 70-80 µm wide; epithecium orange, K+ purple-red; hymenium colourless, 50-60 µm high; paraphyses c. 2 µm thick at base, the apical cells swollen, up to 5 µm wide; hypothecium colourless, up to 50 µm high. Asci 8-spored, clavate, functionally unitunicate, apically thickened with a broad internal beak, the inner part of apex and external cap I+ blue, Teloschistes-type. Ascospores mostly poorly developed, 2-celled, polarilocular, hyaline, broadly ellipsoid, 9-12 x (6-)7-9 µm, the equatorial thickening (“septum”) 6-7 µm. Pycnidia immersed into orange-red warts. Conidia ellipsoid, 2.5-3 x 1-1.2 µm. Photobiont chlorococcoid. Spot tests: thallus and apothecia K+ purple-red, C-, KC-, P-, UV+ intensely orange-red. Chemistry: thallus and apothecia with unidentified anthraquinones.

Note: a strictly Mediterranean calcicolous species, ecologically similar to X. mediterranea, known from several stations throughout the southern part of the Mediterranean region, and from the Negev-desert; often confused with X. calcicola and X. mediterranea in the past.

Growth form: Foliose, broad lobed

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly asexual, by isidia, or isidia-like structures (e.g. schizidia)

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: very rare

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; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (21795)
2001/12/03
detail of isidia

Manuel Gil

Spain, Canary Islands, Guatisea, Lanzarote

Manuel Gil

Spain, Canary Islands, Guatisea, Lanzarote