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Images of British Lichens



Gyalecta ulmi (Sw.) Zahlbr.


Thallus a thin, greyish crust over the substratum; apothecia with thick, densely white-pruinose, crenate margins and chestnut red discs. Widespread but now very rare, on moss and damp, calcareous rocks, formerly on damp bases of elm (Ulmus) trunks.
British Red Data Book species: endangered; scheduled protected species, Wildlife and Countryside Act 1981.

Refs: Smith et al. (2009), 421; Purvis et al. (1992), 262; Dobson (2005), 184; Dobson (2011), 190; Wirth (1995), 1: 409, 413 (photo); Wirth, Hauck & Schulz (2013), 1: 501 (photo), 502; Moberg & Holmåson (1984), 211 (photo); Holien & Tønsberg (2008), 203 (photo); Thor & Arvidsson (1999), 185, 270 (photo); Arup et al. (1997), 181 (photo); Puntillo (1996), plate 19 (photo).

 
Gyalecta ulmi
On damp, shaded limestone rockface, Braemar, Aberdeenshire, March 2008


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© A.J. Silverside
Uploaded August 2009, replacing previous page, last updated September 2013 (previous page first hosted at www-biol.paisley.ac.uk, December 2006)