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Images of British Lichens

Lecanora confusa Almb.

Thallus a thin, pale to yellowish-grey, dispersed-granular to continuously nodulose crust, reacting orange with bleach (sodium hypochlorite), soredia absent; apothecia usually abundant and often crowded, discs yellow-green to brownish, thalline margins pale, conspicuous, smooth to irregularly distorted or warted, ascospores, approx. 10-14×4-5µm (Edwards et al. in Smith et al., 2009). On smooth bark, twigs and worked wood, widespread, more common in the west.

Refs: Smith et al. (2009), 482; Purvis et al. (1992), 302; Dobson (2005), 218-9 (photo); Dobson (2011), 223-4 (photo); van Herk & Aptroot (2004, 2013), 206-7 (photo).

L. varia closely resembles this species and can occur with it on worked timber. Unlike L. confusa, its thallus gives no reaction with sodium hypochlorite, and it has distinctly wider, egg-shaped spores, approx. 10-12×6-7µm (my measurements).

Lecanora confusa
On bark, with other Lecanora species, Pembroke, Pembrokeshire, May 2009

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Uploaded February 2014