Identification key
Physconia grisea
(1) Physconia grisea
Description
Thallus
Foliose, up to 8 cm, sometimes confluent with other thalli, lobes 3 mm wide, short, overlapping, covered with a white pruinose, especially at the tips
Foliose, up to 8 cm, sometimes confluent with other thalli, lobes 3 mm wide, short, overlapping, covered with a white pruinose, especially at the tips
Color
Brownish gray when dry, green when wet
Brownish gray when dry, green when wet
Reproduction
Apothecia: very rare, with sorediate and pruinose margin
Soralia: coarsely grainy, initially localized on the lobe margin, then gradually covering the center of the thallus
Isidia: absence
Apothecia: very rare, with sorediate and pruinose margin
Soralia: coarsely grainy, initially localized on the lobe margin, then gradually covering the center of the thallus
Isidia: absence
Risk of confusion
Physconia distorta, species not sordium and with frequent apothecia
Physconia distorta, species not sordium and with frequent apothecia
Ecology
Substrate
On nutrient-rich bark (with dust)
On nutrient-rich bark (with dust)
Habitat
Nitrophilous
Nitrophilous
Occurrence
Very common
Very common
Sensitivity to air pollution
Resistant to pollution
Resistant to pollution
(2)
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