Images of British Lichens
Lecanora dispersa (Pers.) Sommerf.
Thallus thin and disappearing or immersed, leaving apothecia mostly scattered on the substrate surface; apothecia small, usually <1mm diameter, with discs variable in colour but generally grey-brown, margins pruinose, not or only weakly crenulate, discs with epithecial granules not soluble in KOH. Inconspicuous but very common throughout Britain on a variety of substrates, including concrete and rather nutrient-rich rocks, becoming a ubiquitous urban species.
Refs: Śliwa (2007), 26 (photo); Smith et al. (2009), 484; Purvis et al. (1992), 304; Dobson (2005), 220 (photo); Dobson (2011), 225 (photo, poorly printed); Fox et al. (2003), plate 8 (photo); Valcárcel et al. (2003), 212-3 (photo); Wirth (1995), 1: 458-459 (photo); Wirth et al. (2004), 254 (photo); Wirth, Hauck & Schulz (2013), 1: 585 (photo), 587; van Herk & Aptroot (2004, 2013), 210-211 (photo); Thomson (1997), 278 (excluding f. albescens).
L. semipallida is a closely similar species with a usually dark grey to black thallus, generally grouped apothecia, epithecial granules of apothecia soluble in KOH, see Śliwa (2007), 51; Dobson (2011), 225. It has become understood only relatively recently but is proving common, e.g. on concrete wall-cappings, the two species frequently occurring together. The photograph of L. dispersa in Brodo et al. (2001), 380, is now considered to be this species. I have removed the original photograph on this web-page as it also seems likely to be L. semipallida . A page on L. semipallida will be added to this site.
|On churchyard wall, Great Chrishall, North Essex (vice-county), April 2012|
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Uploaded March 2008, significant revision August 2013, last updated January 2016