Images of British Lichens
Thelotrema lepadinum (Ach.) Ach.
A variable species with a thin to thick, cream to pale grey crustose thallus; apothecia scattered and neatly conical to crowded with thick, scurfy margins, the latter state more characteristic of damp, shaded sites (James & Hawksworth, in Smith et al.,2009), the proper margin separating from the thalline margin to become visible as a membrane-like inner ring, disk black but generally white-grey pruinose. Widespread but perhaps more common in the west, on bark, rarely on rocks.
Refs: Smith et al. (2009), 892; Purvis et al. (1992), 600; Dobson (2005), 427 (photo); Dobson (2011), 433 (photo); Jahns (1983), 256-7 (photo); Whelan (2011), 145 (photo); van Herk & Aptroot (2004, 2013), 362-3 (photo); van Haluwyn et al. (2009), 188-9 (photos); Wirth (1995), 2: 905 (photo); Wirth, Hauck & Schulz (2013), 2: 1097 (photo); Frahm et al. (2010), 66 (photo); Moberg & Holmåson (1984), 212 (photo); Holien & Tønsberg (2008), 201 (photo); Arup et al. (1997), 237 (photo); Puntillo (1996), plate 38 (photo); Brodo et al. (2001), 681 (photo).
|On Oak (Quercus petraea) in open, oceanic woodland, Ardilistry, Islay, May 2011 (BLS meeting)|
|On Ash (Fraxinus excelsior) in shady, riverside woodland, Logie, Morayshire, August 2009 (BLS meeting)|
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Uploaded August 2013, updated December 2013