AppearanceLarge, to 10cm diameter, with a thallus of closely adpressed, thin, rosette forming lobes. The upper surface is a dull grey-green ro grey-brown colour when dry, with a smooth, almost oily appearance, but bright green when wet. The lower surface is almost white with a fine, brown tomentum. Thallus lobes are short, narrow and unridged (like a "Parmelia"), 3-10mm wide. The inner lobes are incised and contorted, the marginal lobes rounded at the apices and smooth. There are no soralia or isidia, but occasionally few to numerous marginal folioles.
Apothecia are usually abundant, and when young appear as volcano-like swellings which open out to expose the brown disc with a warted margin. The spores are colourless, becoming brown when mature, persistently 1-septate, 25-45 x 8-11 μm.
Spot reactions negative but sometimes K+ faint yellow and KC+ faint pink. Contains scrobiculin.
DistributionLocally common in the southwest of England (Cornwall, Devon, Somerset and Dorset) and in the New Forest, but now extinct from former sites in Sussex. In northern England still present at two sites in Cumbria and one in Northumberland. Still locally common in western Scotland and the far west of Ireland.
Worldwide Lobaria virens is only known from western Europe and Macronesia. It is very local and more oceanic than the other Lobaria species, and is now rarely found east of the Loire and French Pyrenees. There are no recent reports from central Europe.
HabitatOn broad-leaved trees, especially oak, ash, sycamore, hazel, elm and beech. Mostly confined to ancient woodlands and parklands, occasionally on sheltered rocks in woods and on western sea-cliffs. This is the most oceanic and shade tolerant of the British Lobaria species.
An important member of the Lobarion, particularly in more shaded, sheltered sites where it occurs with Lobaria pulmonaria, Sticta spp and Nephroma spp.
Some text fragments are auto parsed from Wikipedia.https://www.britishlichensociety.org.uk/resources/species-accounts/lobaria-virens