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Arthonia elegans (Ach.) Almq., auct. Brit.


Thallus an immersed, cream to yellowish to pale reddish brown crust; apothecia set in the thallus, variable but generally linear with pointed ends, sometimes branched or stellate, discs dark purple-brown, sometimes with reddish pruina along the margins; ascospores mostly 3-4-septate. On nutrient-rich, smooth bark, generally of Hazel (Corylus), locally common in old and oceanic woodland, especially in the south and west. Generally recognisable in the field but part of a large genus in which chemical tests and microscopic examination are important. The name may be misapplied to British material (Coppins & Aptroot, in Smith et al., 2009).

Refs. (for A. elegans s.l.): Smith et al. (2009), 161; Purvis et al. (1992), 80; Dobson (2005), 66 (photo); Dobson (2011), 72 (photo); Puntillo (1996), plate 3 (photo).

FGBI: http://fungi.myspecies.info/all-fungi/arthonia-elegans

 
Arthonia elegans
Arthonia elegans, close-up
On Hazel (Corylus avellana) trunk, Ardilistry, Islay, May 2011, BLS meeting


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Uploaded February 2013, last updated January 2016