• Buellia stellulata (Taylor) Mudd [3]
Buellia stellulata
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This rock-inhabiting, crustose lichen is virtually identical to B. aethelea (described elsewhere) but with a tiny, cracked thallus that is more or less white in colour. It is a coastal species that is usually associated with rocky places close to the sea. It is relatively common in suitable habitats in Ireland, but unlike Buellia aethelea tests K+ yellow not K+ yellow to red. Present in most coastal districts of Ireland.

Key characteristics

  • Very close to Buellia aethelea, and may also be confused with some small Rhizocarpon species. The almost-white thallus helps to suggest this species, being much paler than that of Buellia aethelea which is brown-grey (never white)
  • Both species are K+ yellow, but in the case of Buellia stellulata, the yellow colour change progresses through to red.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Buellia stellulata (Taylor) Mudd [3]. [In] LichenIreland. Accessed on 2018-08-16.