Identification key
Physcia aipolia/P. stellaris
(1) Physcia aipolia / P. stellaris
Description
Thallus
Foliose, up to 10 cm in diameter, lobes 1–2 mm wide, well-attached to the substrate, often covered with numerous white spots (macules) clearly visible with a magnifying glass, especially on moist thallus
Foliose, up to 10 cm in diameter, lobes 1–2 mm wide, well-attached to the substrate, often covered with numerous white spots (macules) clearly visible with a magnifying glass, especially on moist thallus
Color
Whitish-grey to bluish-grey when dry, blue-green when wet (4)
Whitish-grey to bluish-grey when dry, blue-green when wet (4)
Reproduction
Apothecia: abundant, 2–3 mm in diameter, pruinose black-brown disk
Soralia: absence
Isidia: absence
Apothecia: abundant, 2–3 mm in diameter, pruinose black-brown disk
Soralia: absence
Isidia: absence
Risk of confusion
Anaptychia ciliaris, larger, with a clearly fruticular thallus Physcia adscendens / P. tenella, rarely showing apothecia and abundantly provided with greenish soralia
Physcia leptalea, showing cilia on the lobe margins
Anaptychia ciliaris, larger, with a clearly fruticular thallus Physcia adscendens / P. tenella, rarely showing apothecia and abundantly provided with greenish soralia
Physcia leptalea, showing cilia on the lobe margins
Ecology
Substrate
On bark, more often on branch than on trunk
On bark, more often on branch than on trunk
Habitat
Slightly nitrophilous
Slightly nitrophilous
Occurrence
Relatively common
Relatively common
Sensitivity to air pollution
Resistant to pollution
Resistant to pollution
(2)
(3)
(4)
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