Irish lichens

Order: Lecanorales       Family: Parmeliaceae

Species: Parmelina tilacea

Growth type foliose.
Photos: On Lime. Bandon, Co. Cork, SW Ireland.

Thallus of +/- loosely attached grey or bluish-greyish lobes. Upper surface faintly maculate, lobe margins +/- rounded and irregularly indented. Lower surface black, light brown at margins, rhizines simple. Pale brown to greyish-brown isidia arise in the centre of the thallus and spread, forming a dense crust. Apothecia very rare.

Occurs on sunny, +/- nutrient-rich bark, rocks, roof tiles and asphalt paths. Occasional in S and SE Ireland.
Cortex K+ yellow. Medulla K-, C+ carmine-red, KC+ red, P-, UV-

Similar: Parmelina pastillifera has blue-black isidia

Parmelina tiliacea December 2009

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