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Dermatocarpon luridum (With.) J.R.Laundon


Thallus a mat of multiple lobes up to approx. 15mm in width, grey or pale to dark brown, lacking pruina, bight green when wet, lobes lacking rhizines but thallus with holdfasts, medulla in section reacting red with Melzer's reagent (the only British Dermatocarpon to do so); fruitbodies perithecia, immersed in groups in the thallus. Locally frequent on wet rocks in the north and west, generally on the margins of lochs and rivers where it may be periodically submerged.

Refs: Smith et al. (2009), 373; Purvis et al. (1992), 233; Dobson (2005), 161-2 (photo); Dobson (2011), 168 (photo); Thüs & Schultz (2009), 52, 219 (photo); Wirth (1995), 1: 371 (photo); Wirth, Hauck & Schulz (2013), 1: 451 (photo); Moberg & Holmåson (1984), 214 (photo, as D. weberi); Stenroos et al. (2011), 38 & 203 (photos); Valcárcel et al. (2003), 180-1 (photo, dry); Brodo et al. (2001), 297 (photo); Hinds & Hinds (2007), 236 (photo); Walewski (2007), 70 (photo).

FGBI: http://fungi.myspecies.info/all-fungi/dermatocarpon-luridum

Dermatocarpon luridum, closer view
Dermatocarpon luridum, close view
On riverside rocks close to the water, Dartmoor, Devon, August 2011
 
Dermatocarpon luridum
Dermatocarpon luridum, enlarged view showing perithecia
Amongst semi-aquatic mosses on wet rocks at lochside, Loch Lomond, Stirlingshire, May 2010, lower photograph showing perithecia (arrowed)


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Uploaded December 2011, last updated January 2016