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Images of British Lichens

Lecanora chlarotera Nyl.

Thallus crustose, cream to pale grey, almost smooth to strongly warted (like lumpy porridge), often forming distinct, rounded colonies but not bounded by a prothallus; apothecia with thick, thalline, crenulate or contorted margins, discs buff to chestnut brown, not or only slightly pruinose; the commonest of a complex of similar species that require chemical tests and microscopic examination of cross-sections of the hymenium and apothecial margins for certain identification. Widespread and common on smooth, nutrient-rich bark, a characteristic early coloniser of young, planted, semi-urban trees, as in supermarket car-parks.

Refs: Smith et al. (2009), 480; Purvis et al. (1992), 301; Dobson (2005), 217 (photo); Dobson (2011), 223 (photo); Fox et al. (2003), plate 7 (photo); Jahns (1983), 206-7 (photo); Whelan (2011), 104 (photo); van Haluwyn et al. (2009), 212-3 (photo); van Herk & Aptroot (2004, 2013), 204-205 (photo); Valcárcel et al. (2003), 210-11 (photo); Wirth (1995), 1: 464, 469 (photo); Wirth et al. (2004), 292 (photo); Wirth, Hauck & Schulz (2013), 1: 569, 593 (photo); Frahm et al. (2010), 40-41 (photo); ? Moberg & Holmåson (1984), 115 (photo, as "L. subfuscata"); Holien & Tønsberg (2008), 165 (photo); Thomson (1997), 273.

Frequently parasitised by Vouauxiella species: V. lichenicola and, less often, V. verrucosa.

Lecanora chlarotera
Lecanora chlarotera
Lecanora chlarotera, close-up
On Ash (Fraxinus excelsior), Chatelherault, Lanarkshire, March 2008

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© A.J. Silverside
Uploaded November 2008, last updated December 2013