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Images of British Lichens

Acarospora macrospora (Hepp) A.Massal. ex Bagl.

Thallus consisting of interlocking, angular, brown areoles, testing negative with KOH and sodium hypochlorite (bleach); apothecia one or more per areole, darker, immersed or with distinct margins. A very local and mainly upland species on calcareous rocks, forming sheets over the rock surface. A. fuscata is very similar and much more widespread; it diagnostically tests red with sodium hypochlorite and tends to have more sunken and irregularly-shaped apothecia.

Refs: Smith et al. (2009), 129; Purvis et al. (1992), 61; Wirth (1995), 1: 104, 105 (photo); Wirth et al. (2004), 230 (photo); Wirth, Hauck & Schulz (2013), 1: 133 (photo), 134.

Acarospora macrospora
On limestone rockface, Braemar, Aberdeenshire, March 2008
Acarospora macrospora
Acarospora macrospora, enlarged view
On limestone rockface, Braemar, Aberdeenshire, April 2003

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© A.J. Silverside
Uploaded March 2008, last modified September 2013 (first hosted at, December 2006)