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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).

Thelotrema lepadinum
Thelotrema lepadinum
Thelotrema lepadinum
Thelotrema lepadinum, close up
On Oak (Quercus petraea) in open, oceanic woodland, Ardilistry, Islay, May 2011 (BLS meeting)
 
Thelotrema lepadinum
Thelotrema lepadinum, enlarged
On Ash (Fraxinus excelsior) in shady, riverside woodland, Logie, Morayshire, August 2009 (BLS meeting)


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© A.J. Silverside
Uploaded August 2013, updated December 2013