Identification key
Phaeophyscia orbicularis
(1) Phaeophyscia orbicularis
Description
Thallus
Foliose, very small (up to 5 cm), with radiating, narrow lobes (maximum 2 mm wide), with black rhizines overflowing from the lobe edges (3)

Color
Upper side greenish-grey or brownish when dry, greenish when wet
Reproduction
Apothecia: rare, up to 1.5 mm in diameter
Soralia: variable in color (greenish, yellowish, or brownish), often abundant in the central part of the thallus

Isidia: absence
Risk of confusion
Hyperphyscia adglutinata, very common, generally smaller, more adhérent to the substrate, without overflowing rhizines
Ecology
Substrate
On bark, rock or artificial substrate

Habitat
Nitrophilous

Occurrence
Very common

Sensitivity to air pollution
Resistant to pollution

(2)
(3)