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Images of British Lichens

Collema cristatum (L.) Weber ex F.H. Wigg.

Thalli foliose, variable, often forming arcs through die-back of the central part, lobes smooth, dull olive-green to dark brown or black, concave and elongate, with raised, incised to lobulate margins, isidia typically absent (though an isidiate variant exists); apothecia usually present and often crowded. Widespread on hard limestones and on calcareous dunes.

Refs: Smith et al. (2009), 351; Purvis et al. (1992), 220; Dobson (2005), 152 (photo); Dobson (2011), 158 (photo); Jahns (1983), 182-3 (photo); Whelan (2011), 83 (photos); Nordic Lichen Flora (2007) 3: 19, 173 (photo); Stenroos et al. (2011), 188 (photo); Wirth (1995), 1: 352, 355 (photo, wet); Wirth et al. (2004), 157 (photo); Wirth, Hauck & Schulz (2013), 1: 424, 427 (photo).


Collema cristatum, with apothecia
Collema cristatum, without apothecia
In dry state on limestone rocks, Alston Moor, Cumberland, August 2012
Collema cristatum (dry)
Collema cristatum (dry)
Collema cristatum (wet)
In dry then wetted state on limestone rocks, Ingleton, Yorkshire, July 2013
Collema cristatum
In dry state on limestone rocks, Schiehallion, Perthshire, April 2003

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© A.J. Silverside
Uploaded March 2008, last updated January 2016 (first hosted at, December 2006)