Identification key
Melanohalea exasperata
(1) Melanohalea exasperata
Description
Thallus
Foliose, up to 6 cm, well attached to the substrate, lobes bearing many small conical warts

Color
Upper side reddish-brown to black-brown, turning green in the presence of water
Reproduction
Apothecia: often present, bowl-shaped, 2-6 mm in diameter, disc green to brownish, rim with many warts
Soralia: absence
Isidia: absence
Risk of confusion
Distinguished from other Melanohalea by its frequent warts and apothecia
Ecology
Substrate
On branch, sometimes on bark

Habitat
Heliophilous

Occurrence
Rather rare

Sensitivity to air pollution
Sensitive to pollution

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