Identification key
Physconia distorta
(1) Physconia distorta
Description
Thallus
Foliose, up to 15 cm, radiating lobes (up to 4 mm wide), covered with a white pruinose, especially towards the tips
Foliose, up to 15 cm, radiating lobes (up to 4 mm wide), covered with a white pruinose, especially towards the tips
Color
Brownish gray when dry, green when wet
Brownish gray when dry, green when wet
Reproduction
Apothecia: numerous, 2 to 5 mm in diameter, disk dark, flat, covered with a whitish to bluish pruinose
Soralia: absence
Isidia: absence
Apothecia: numerous, 2 to 5 mm in diameter, disk dark, flat, covered with a whitish to bluish pruinose
Soralia: absence
Isidia: absence
Risk of confusion
Physconia grisea, has rare apothecia and is sorediate
Physcia aipolia/P. stellaris, has macules but is not pruinose
Physconia grisea, has rare apothecia and is sorediate
Physcia aipolia/P. stellaris, has macules but is not pruinose
Ecology
Substrate
On bark
On bark
Habitat
Nitrophilous
Nitrophilous
Occurrence
Relatively common
Relatively common
Sensitivity to air pollution
Resistant to pollution
Resistant to pollution
(2)
(3)
(4)
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