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Diploschistes muscorum (Scop.) R.Sant.


Initially a parasite on Cladonia species, commonly C. pocillum, or on Stereocaulon, killing the host and taking over the algae, then extending as a thick, uneven to warted, white to pale grey crust; apothecia with black but grey-pruinose, sunken discs and thick margins. Widespread but local, on calcareous soil, including dunes and soil caps on walls, frequently overgrowing mosses.

Refs: Smith et al. (2009), 380; Purvis et al. (1992), 237; Dobson (2005), 166; Dobson (2011), 172; Jahns (1983), 256-257 (photo, printed with strong colour cast in my copy); van Herk & Aptroot (2004, 2013), 172-3 (photo); Aptroot et al. (2011), 128-9 (photos); Wirth (1995), 1: 379 (photo); Wirth et al. (2004), 184 (photo); Wirth, Hauck & Schulz (2013), 1: 457 (photo), 458; Schumm (2011), 194-197 (photos); Hansen & Anderson (1995) 88 (photo); Thomsom (1997), 217; Brodo et al. (2001), 304 (photo).

FGBI: http://fungi.myspecies.info/all-fungi/diploschistes-muscorum

Diploschistes muscorum, with apothecia
Diploschistes muscorum
In thin, sandy turf over limestone, Stackpole, Pembrokeshire, May 2009


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Uploaded January 2012, last updated January 2016