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Images of British Lichens

Placidium squamulosum (Ach.) Breuss
(= Catapyrenium squamulosum (Ach.) Breuss)

Thallus consisting of individual to grouped, yellow- to red- or dark-brown squamules, pale beneath, with colourless rhizoidal hyphae; surface developing black spots, i.e. pycnidia and perithecia, which are laminar as distinct from marginal and immersed in the thallus surface. Widespread but local, on calcareous soil, including dunes, soil caps on walls, and in rock crevices.

Refs: Smith et al. (2009), 710; Purvis et al. (1992), 165 (as Catapyrenium); Dobson (2005), 115 (photo, as Catapyrenium); Dobson (2011), 347 (photo); Whelan (2011), 132 (photo); van Herk & Aptroot (2004, 2013), 114-5 (photo, as Catapyrenium); Wirth (1995), 1: 255 (photo, as Catapyrenium); Wirth et al. (2004), 170 (photo, as Catapyrenium); Wirth, Hauck & Schulz (2013), 1: 331, 2: 888 (photo); Stenroos et al. (2011), 370 (photo); Hinds & Hinds (2007), 409 (photo).

Placidium squamulosum
On open ground in dune turf over limestone, Stackpole, Pembrokeshire, May 2009 (arrowed), with Psora decipiens, the pale brown thalli with white margins.

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© A.J. Silverside
Uploaded January 2012, last updated December 2013