Identification key
Parmelia saxatilis
(1) Parmelia saxatilis
Description
Thallus
Foliose, up to 20 cm in diameter, loosely adherent to the substrate, with 3 mm wide square-shaped lobes and a network of clearly visible whitish fissures (pseudocyphellae)
Foliose, up to 20 cm in diameter, loosely adherent to the substrate, with 3 mm wide square-shaped lobes and a network of clearly visible whitish fissures (pseudocyphellae)
Color
Grey-blue upper side (darker in very sunny areas), black underside
Grey-blue upper side (darker in very sunny areas), black underside
Reproduction
Apothecia: rare, reddish-brown disk, isidial margin
Soralia: absence
Isidia: numerous, slightly browned at the tip, of various shapes
Apothecia: rare, reddish-brown disk, isidial margin
Soralia: absence
Isidia: numerous, slightly browned at the tip, of various shapes
Risk of confusion
Parmelia sulcata, more common, sorediate, also having pseudocyphellae
Parmelia sulcata, more common, sorediate, also having pseudocyphellae
Ecology
Substrate
On bark and non-calcareous rock
On bark and non-calcareous rock
Habitat
Heliophilous and acidophilous
Heliophilous and acidophilous
Occurrence
Common
Common
Sensitivity to air pollution
Moderately sensitive to pollution
Moderately sensitive to pollution
(2)
(3)
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