Pertusaria schaereri Hafellner
[in Hafellner & Türk], Preslia, 76: 155, 2001, nom. nov. - Spiloma isidioides Schaer., Naturw. Anz. Alllg. Schweiz Ges. Gesamt. Naturwiss., 5: 34, 1821.

Synonims: Pertusaria isidioides (Schaer.) Arnold non (Borrer) Hook. f.

Is present in the following regions (Click here for a map with abbreviations):
N - Frl (Tretiach & Hafellner 2000), TAA, VA (Borlandelli & al. 1996, Piervittori & Isocrono 1997, 1999), Emil (TSB).

References (type author's name):

Click here to search the TSB Herbarium for samples of this taxon.

Photobiont: Green algae other than Trentepohlia
Growth form: Crustose
Reproductive strategy: Mainly asexual, by isidia or isidia-like structures, e.g. schizidia
Poleophoby: 3


  • pH of the substrata: intermediate between very acid and subneutral (2) to subneutral (3)
  • in sites with diffuse light but scarce direct solar irradiation (3) to sun-exposed sites, but avoiding extreme solar irradiation (4)
  • humidity requirements: rather hygrophytic (2)
  • in sites with no eutrophication (1)
  • from the oroboreal belt of the Alps (4) to the nival belt (6)

    Note: on base- or mineral-rich rocks in rainy areas, probably restricted to the Alps in Italy.

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