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Images of British Lichens

Phlyctis agelaea (Ach.) Flot.

Thallus a whitish-grey, smooth to cracked crust, reacting yellow, becoming slowly red, with potassium hydroxide; apothecia embedded in the thallus, scattered, flat, superficially resembling soralia, pinkish to dark but covered by white, powdery granules. Widespread but rare in damp and sheltered woodland, on smooth bark, very rarely on rocks.

Refs: Smith et al. (2009), 696; Purvis et al. (1992), 465; Dobson (2005), 334-5 (photo); Dobson (2011), 336 (photo, poorly printed); Wirth (1995), 2: 721 (photo, left); Wirth, Hauck & Schulz (2013), 2: 865 (photo); Frahm et al. (2010), 66-7 (photo); Arup et al. (1997), 232 (photo); Thor & Arvidsson (1999), 304 (photo); Valcárcel et al. (2003), 304-5 (photo).

Phlyctis agelaea
Phlyctis agelaea, habitat
On Hazel (Corylus avellana), Craighouse, Jura, May 2011 (BLS meeting)
Phlyctis agelaea
On Sycamore (Acer pseudoplatanus), Ballygrant, Islay, May 2011 (BLS meeting)

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© A.J. Silverside
Uploaded August 2013, updated September 2013