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Images of British Lichens

Verrucaria macrostoma Dufour ex DC.

Thallus cracked-areolate or subsquamulose, olive-green or shades of brown, 'looking like dried mud' (Dobson), prothallus indistinct, isidia or soredia sometimes present on the areolar margins; perithecia half-projecting above the surfaces of the areoles. On hard limestones, concrete, mortar of walls and other calcareous substrates, widespread but predominantly in the south and east.

Refs: Smith et al. (2009), 950; Purvis et al. (1992), 638; Orange (2008); Dobson (2005), 456 (photo); Dobson (2011), 463 (photo); Whelan (2011), 150 (photo); van Herk & Aptroot (2004, 2013), 382-3 (photo, f. furfuracea); Wirth, Hauck & Schulz (2013), 2: 1158, 1170 (photo).

Can be confused with Acarospora species, notably A. fuscata, but Acarospora species have apothecia (generally inconspicuous and sunken, commonly angular) rather than perithecia.

Verrucaria macrostoma
Verrucaria macrostoma, magnified view
On limestone rocks, Tomphubil, Perthshire, April 2003

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