Identification key
Xanthoria parietina
(1) Xanthoria parietina
Description
Thallus
Foliose, up to 15 cm in diameter, with flat, rounded lobes, tight to the substrate
Foliose, up to 15 cm in diameter, with flat, rounded lobes, tight to the substrate
Color
From yellow-orange in the sun (2) to gray-greenish in the shade (3)
From yellow-orange in the sun (2) to gray-greenish in the shade (3)
Reproduction
Apothecia: frequent, orange disc
Soralia: absence
Isidia: absence
Apothecia: frequent, orange disc
Soralia: absence
Isidia: absence
Risk of confusion
Polycauliona polycarpa, with a reduced and inconspicuous thallus, almost entirely covered with apothecia
Polycauliona polycarpa, with a reduced and inconspicuous thallus, almost entirely covered with apothecia
Ecology
Substrate
On bark, sometimes on rock or artificial substrate
On bark, sometimes on rock or artificial substrate
Habitat
Heliophilous and nitrophilous
Heliophilous and nitrophilous
Occurrence
Very common
Very common
Sensitivity to air pollution
Resistant to pollution
Resistant to pollution
(2) Sunny form
(3) Shaded form
(4) Necrotic form
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