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(Map updated: 11 August 2009)

In past times this common foliose lichen was the wool-dyer's ‘crottle’. The thallus which forms neat, grey to grey-green rosettes on acid-barked trees and rocks has square-scalloped lobe ends, covered in a net of fine white lines (best seen along the edge of the plant) surmounted by a dense mass of stick-shaped outgrowths (isidia).

Key characteristics

• Net of white lines over the lobes covered in stick-like outgrowths (isidia)
• Grey or grey-green coloured lobes with ends slightly burnished or bronzed.

Original text submitted by Vince J. Giavarini