ITALIC 8.0

Rusavskia elegans (Link) S.Y. Kondr. & Kärnefelt subsp. orbicularis (Schaer.)

Provisionally placed here, ICN Art. 36.1b.. Basionym: Parmelia elegans var. orbicularis Schaer. - Enum. Crit. Lich. Eur.: 51, 1850.

Synonyms: Xanthoria elegans subsp. orbicularis (Schaer.) Clauzade & Cl. Roux

Distribution: N - Frl (vidi!), Ven (Nimis 1994), TAA, Piem (Morisi & Sereno 1995).

Description: Thallus foliose, heteromerous, dorsiventral, tightly adnate, orange-yellow, deep orange to orange-red, forming up to 6 cm wide rosettes, the central parts often dying off in old thalli. Lobes flat, 2-3 mm wide at apex, discrete for much of their length, usually short an not markedly sinuous, emaculate; lower surface white, rarely with very short, white hapters. Upper and lower cortex mesodermate paraplectenchymatous; medulla white. Apothecia common, zeorine, laminal, substipitate, up to 2 mm across, orange to orange-red. Epithecium orange-brown; hymenium colourless; paraphyses simple or sparingly branched, septate, swollen at tips; hypothecium colourless to pale brown. 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 2-celled, polarilocular, hyaline, ellipsoid, 9-18 x 5-9 µm, the equatorial thickening (“septum”) 3-5 µm. Photobiont chlorococcoid. Spot tests: upper surface K+ purple-red, C-, KC-, P-, UV+ intensely orange-red. Chemistry: thallus and apothecia with parietin (major), fallacinal, emodin, teloschistin and parietinic acid (minor), corresponding with chemosyndrome A of Søchting (1997).

Note: this taxon, which is most frequent in the Alps near treeline, needs further study: it might prove to be unrelated to the typical subspecies.

Growth form: Foliose, narrow lobed

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: extremely rare

Subalpine belt: rather rare

Oromediterranean belt: absent

Montane belt: very 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 19723

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

Herbarium: TSB (19723)
2003/03/17