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Diploicia canescens (Dicks.) A.Massal.


Thallus pure white to bluish white or grey-white, green when damp, placodioid with radiating lobules, thickly pruinose, with greyish-cream soralia that may coalesce in the centre of the thallus, apothecia small, lecideine, with black discs, generally rare but apparently more frequent in shade, thallus sometimes dotted with black pycnidia, more so when fertile. Widespread, common in the south, becoming rarer and mainly coastal in the north, on rocks, walls, stonework and nutrient-enriched bark.

Refs: Smith et al. (2009), 378; Purvis et al. (1992), 235; Dobson (2005), 164-5 (photo); Dobson (2011), 171 (photo); Allen (2007), 19 (photo); Jahns (1983), 254-5 (photo); Whelan (2011), 92 (photo); van Haluwyn et al. (2009), 148-9 (photos); van Herk & Aptroot (2004, 2013), 172-173 (photo); Thor & Arvidsson (1999), 159, 263 (photo); Arup et al. (1997), 177 (photo); Wirth (1995), 1: 377 (photo); Wirth et al. (2004), 193 (photo); Wirth, Hauck & Schulz (2013), 1: 455 (photo); Frahm et al. (2010), 97 (photo); Nordic Lichen Flora (2002) 2: 25, 95 (photo); Valcárcel et al. (2003), 184-5 (photo); Brodo et al. (2001), 302-3 (photo).

FGBI: http://fungi.myspecies.info/all-fungi/diploicia-canescens

Diploicia canescens
On church wall, Holme next the Sea, Norfolk, July 2009
 
Diploicia canescens
Diploicia canescens, close-up showing soredia
On coastal rocks, Kennedy's Pass, Ayrshire, May 2008
 
Diploicia canescens, close-up showing soredia
Diploicia canescens, close-up showing soredia
Diploicia canescens, habitat shot
On roadside tree stump (Wych Elm, Ulmus glabra) impregnated with dust, West Saltoun, East Lothian, March 2009
 
Diploicia canescens, with apothecia
Material with apothecia, on Sycamore (Acer pseudoplatanus), Stoneykirk, Wigtownshire, April 2013
 
Diploicia canescens, with apothecia
Diploicia canescens, with apothecia
Diploicia canescens, with apothecia
Damp material, with apothecia, on Ash (Fraxinus excelsior) Slapton, South Devon, August 2011


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© A.J. Silverside
Uploaded August 2009, last updated January 2016