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Arthonia radiata (Pers.) Ach.


Thallus a smooth, greyish white crust with embedded, black, variable but usually irregularly stellate apothecia (typically 1-2mm in diameter); ascospores 3-septate. On nutrient-rich, smooth bark and twigs on a variety of species but a characteristic species on Ash (Fraxinus excelsior), widespread and often very common but still recolonising areas of formerly high sulphur dioxide pollution. Generally recognisable in the field but part of a large genus in which chemical tests and microscopic examination are important.

Refs: Smith et al. (2009), 168; Purvis et al. (1992), 86; Dobson (2005), 69 (photo); Dobson (2011), 75-6 (photo); Fox et al. (2003), plate 5 (photo); Whelan (2011), 49 (photo); van Haluwyn et al. (2009), 176-7 (photo); Moberg & Holmåson (1984), 218 (photo); Holien & Tønsberg (2008), 195 (photo); van Herk & Aptroot (2004, 2013), 60-1 (photo); Wirth (1995), 1: 130, 137 (photo); Wirth et al. (2004), 274 (photo); Wirth, Hauck & Schulz (2013), 1: 164 (photo), 168; Frahm et al. (2010), 72 (photo); Puntillo (1996), plate 3 (photo); Valcárcel et al. (2003), 116-7 (photo); Brodo et al. (2001), 165 (photo).

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

 
Arthonia radiata
On Ash (Fraxinus excelsior) branch, Gifford, East Lothian, April 2008


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Uploaded March 2011, last updated January 2016