ITALIC 8.0

Physcia caesia var. rhaetica Frey

Ergebn. Wiss. Unters. Schweiz. Nationalparks, n.F. 3, 27: 484, 1952.

Synonyms:

Distribution: N - Piem (TSB 33303).

Description: Thallus foliose, heteromerous, dorsiventral, narrow-lobed, closely adpressed, forming orbicular to irregular, up to 5(-10) cm wide rosettes. Lobes 0.8-1.5(-3) mm wide, flattened, radiating, usually overlapping, whitish to bluish grey, white-maculate, with a few marginal to apparently laminal, at first convex, then often flattened to concave, blue-grey soralia. Lower surface largely yellow-orange, with dark, mostly simple rhizines. Upper cortex paraplectenchymatous; medulla yellow at least in lower part; lower cortex prosoplectenchymatous with the lowermost part gradually forming rounded, isodiametric cells. Apothecia rare, lecanorine, to 1.5 mm across, with a brown-black, sometimes pruinose disc and an entire to crenulated thalline margin. 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, 17-25 x 6-11 µm, the wall thickened at apex and at septum, Physcia-type. Pycnidia black, immersed. Conidia subcylindrical, 4-6 x 1 µm. Photobiont chlorococcoid. Spot tests: upper cortex K+ yellow, C-, KC-, P- or P+ faintly yellow; medulla and lower surface K+ red. Chemistry: upper cortex with atranorin; medulla with atranorin, zeorin, and skyrin.

Note: a morph with orange medulla, most frequent in continental Alpine areas, which is worthy of further study.

Growth form: Foliose, narrow lobed

Substrata: rocks

Photobiont: green algae other than Trentepohlia

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

Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: very rare

Subalpine belt: 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

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

Herbarium: TSB (34329)
2002/01/02
exposed orange medulla