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.
|On limestone rocks, Tomphubil, Perthshire, April 2003|
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Uploaded September 2008, last updated December 2013