Physcia magnussonii Frey
Erg. wiss. Unters. Schweiz. Nationalpark Unterengadin, n. F. 3, 27: 480, 1952.
Synonyms: Physcia aipolia var. subincisa (Th. Fr.) Lynge; Physcia stellaris var. subincisa Th. Fr.
Description: Thallus foliose, heteromerous, dorsiventral, narrow-lobed, closely adpressed, forming orbicular, up to 8 cm wide rosettes. Lobes to 3 mm wide, usually overlapping, more or less convex, whitish grey to brownish grey, emaculate, distinctly and densely white-pruinose, the margins often down-turned at lobe-tips. Lower surface white to brownish, with a few, stout, simple rhizines. Upper cortex paraplectenchymatous; medulla white. Apothecia common, lecanorine, to 3 mm across, with a usually white-pruinose, otherwise black disc and a smooth 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, narrowly ellipsoid, 16-24 x 6-9 µm, the wall with a distinct verrucose ornamentation, thickened at apex and at septum, Physcia-type. Pycnidia common, immersed, black. Conidia subcylindrical. Photobiont chlorococcoid. Spot tests: upper cortex K+ yellow, C-, KC-, P- or P+ faintly yellow; medulla K- or K+ pale pink, C-, KC-, P-. Chemistry: upper cortex with atranorin; medulla with accessory zeorin and/or variolaric acid.
Growth form: Foliose, narrow lobed
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
On otherwise dry surfaces with short periods of water seepage after rain
Commonnes-rarity: (info)
Alpine belt: absent
Subalpine belt: rare
Montane belt: very rare
Dry submediterranean belt: absent
Humid submediterranean belt: absent
Padanian area: absent
pH of the substrata:
1 2 3 4 5
Solar irradiation:
1 2 3 4 5
Aridity:
1 2 3 4 5
Eutrophication:
1 2 3 4 5
Poleotolerance:
0 1 2 3
Altitudinal distribution:
1 2 3 4 5 6
Rarity
absent
extremely rare
very rare
rare
rather rare
rather common
common
very common
extremely common
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Occurrence data
Predictive map
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (20316)
2001/12/11
Wolfgang von Brackel - CC BY-4.0
Greenland, Qassiarsuk
Growth form: Foliose, narrow lobed
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
On otherwise dry surfaces with short periods of water seepage after rain
Commonnes-rarity: (info)
Alpine belt: absent
Subalpine belt: rare
Montane belt: very rare
Dry submediterranean belt: absent
Humid submediterranean belt: absent
Padanian area: absent
pH of the substrata:
| 1 | 2 | 3 | 4 | 5 |
Solar irradiation:
| 1 | 2 | 3 | 4 | 5 |
Aridity:
| 1 | 2 | 3 | 4 | 5 |
Eutrophication:
| 1 | 2 | 3 | 4 | 5 |
Poleotolerance:
| 0 | 1 | 2 | 3 |
Altitudinal distribution:
| 1 | 2 | 3 | 4 | 5 | 6 |
Rarity
absent
extremely rare
very rare
rare
rather rare
rather common
common
very common
extremely common
Loading data...
Occurrence data
Predictive map
P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (20316)
2001/12/11
