Physcia magnussonii Frey
Erg. wiss. Unters. Schweiz. Nationalpark Unterengadin, 3, n. F. 27: 481, 1952.

Synonims: Physcia aipolia v. subincisa (Th.Fr.) Lynge, Physcia albinea (Anzi) H.Magn. non (Ach.) Nyl., Physcia caesia v. albinea Anzi, Physcia stellaris v. subincisa Th.Fr.

Is present in the following regions (Click here for a map with abbreviations):
N - TAA, Lomb, Piem (TSB), VA (Piervittori & Isocrono 1997, 1999, Piervittori & al. 2001).

References (type author's name):

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Physcia magnussonii Frey

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Photobiont: Green algae other than Trentepohlia
Growth form: Foliose narrow-lobed, Physcia type
Reproductive strategy: Mainly sexual
On: otherwise dry surfaces with periodical seepage of water after rain
Poleophoby: 3


  • pH of the substrata: subneutral (3) to intermediate between subneutral and basic (4)
  • in sun-exposed sites, but avoiding extreme solar irradiation (4) to sites with very high direct solar irradiation (5)
  • humidity requirements: xerophytic (4) to very xerophytic (5)
  • in sites with weak eutrophication (3) to sites with rather high eutrophication (4)
  • from the mediterranean-montane belt (3) to the oroboreal belt of the Alps (4)

    Note: on steeply inclined, base rich siliceous rocks, often starting its development in fissures of the rock, for Italy hitherto known only from the Alps, but likely to be found on some Mediterranean mountains with suitable substrata.

      Commonness-rarity status:
    • Alpine Italy: absent
    • Subalpine Italy: rare
    • Oromediterranean Italy: absent
    • Montane Italy: very rare
    • Padanian Italy: absent
    • Dry submediterranean Italy: absent
    • Dry mediterranean Italy: absent
    • Humid submediterranean Italy: absent
    • Humid mediterraenan Italy: absent