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Arthonia cinnabarina (DC.) Wallr.


Thallus a ± smooth, greyish white to fawn crust, sometimes tinged orange; apothecia set in the thallus but often becoming convex, variable but usually rounded to linear or sometimes branched or stellate, discs brown but white-pruinose, pruina at margins often orange-red; ascospores mostly 4-5-septate. On nutrient-rich, smooth bark and twigs, widespread and locally common, especially in the west.

Refs: Smith et al. (2009), 159; Purvis et al. (1992), 78; Dobson (2005), 65-6 (photo); Dobson (2011), 71-2 (photo); Jahns (1983), 258-9 (photo, as A. tumidula); Whelan (2011), 48 (photo); van Haluwyn et al. (2009), 190-1 (photo); Arup et al. (1997), 161 (photo); Thor & Arvidsson (1999), 227 (photo); Holien & Tønsberg (2008), 194 (photo); Wirth (1995), 1: 128-9 (photo); Wirth et al. (2004), 272 (photo); Wirth, Hauck & Schulz (2013), 1: 138, 436 (photo, as Coniocarpon cinnabarinum); Frahm et al. (2010), 70-1 (photo); Puntillo (1996), plate 2 (photo); Valcárcel et al. (2003), 114-5 (photo); Brodo et al. (2001), 164 (photo).

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

 
Arthonia cinnabarina
On Hazel (Corylus avellana) trunk, Ty Canol, Pembrokeshire, May 2009, rather old material with orange-red pruina lost


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Uploaded March 2011, last updated January 2016