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Buellia disciformis (Fr.) Mudd


Thallus crustose, thin, white to yellowish- or greenish-grey, smooth or cracked, sometimes slightly warted, often bounded by a black prothallus; apothecia black, lecideine, flat or only slightly convex, ascospores brown, generally 1-septate (rarely 3-septate), with somewhat pointed, paler ends. Thallus testing yellow with potassium hydroxide, non-reactive with sodium hypochlorite (bleach). On smooth bark, widespread but commoner in the north and west. Distinguished from Lecidella elaeochroma by flatter apothecia, chemical tests and by the coloured, septate spores. There are other, similar but rarer species of Buellia.

Refs: Bungartz et al. (2007), 138; Smith et al. (2009), 233; Purvis et al. (1992), 133; Dobson (2005), 88 (photo); Dobson (2011), 96 (photo); Nordic Lichen Flora (2002) 2: 16, 91 (photo); Moberg & Holmåson (1984), 195 (photo); Holien & Tønsberg (2008), 155 (photo); Valcárcel et al. (2003), 132-3 (photo).

FGBI: http://fungi.myspecies.info/all-fungi/buellia-disciformis

Buellia disciformis, view
Buellia disciformis, enlarged view
On trunk of Rowan (Sorbus aucuparia), Ardilistry, Islay, May 2011 (BLS meeting)


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Uploaded May 2013, updated January 2016