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Images of British Lichens

Collema auriforme (With.) Coppins & J.R.Laundon

Lobes smooth, to very minutely striate when dry, but not ridged, ± ear-shaped with smooth margins, brown to dark brown or black, producing numerous spherical isidia that become conspicuous when wet, thallus lobes strongly swollen when wet; apothecia infrequently produced, concolorous with thallus, the thick, thalline margins becoming isidiate as they mature. Widespread and locally common in intermittently damp situations, on hard, calcareous rocks, mortar and on shell-sand dunes.

Refs: Smith et al. (2009), 348; Purvis et al. (1992), 218; Dobson (2005), 151 (photo); Dobson (2011), 157 (photo); Whelan (2011), 82 (photos); Nordic Lichen Flora (2007) 3: 16, 171 (photo); Wirth (1995), 1: 352; Wirth, Hauck & Schulz (2013), 1: 424, 425 (photo); Valcárcel et al. (2003), 174-5 (photo).


Collema auriforme
Collema auriforme
Collema auriforme
On limestone rocks, Balnakeil, West Sutherland, August 2012, material with young apothecia (margins not yet isidiate)
Collema auriforme (dry)
Collema auriforme (dry, enlarged view)
Collema auriforme (damp)
Collema auriforme (wet)
On top of limestone table tomb, Billinghay, Lincolnshire, August 2012, dry and damp states
Collema auriforme
On limestone wall, Ballygrant, Islay, May 2011 (BLS meeting)
Collema auriforme, dry
Limestone pavement, Schiehallion, Perthshire, April 2003 (dry state)

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© A.J. Silverside
Uploaded March 2008, substantially revised and extended September 2013, last updated January 2016 (first hosted at, December 2006)