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Placynthium nigrum (Huds.) Gray


Thallus a dark brown to black, coralloid (nodular-isidiate), areolate crust, generally delimited by a distinct, inky blue prothallus; apothecia small, black, shining. Widespread on limestone, mortar of walls and in other calcareous habitats.

Refs: Smith et al. (2009), 717; Purvis et al. (1992), 478; Dobson (2005), 349 (photo); Dobson (2011), 351 (photo); Whelan (2011), 132 (photo); Nordic Lichen Flora (2007) 3: 137, 201 (photo); van Herk & Aptroot (2004, 2013), 310-1 (photo); Valcárcel et al. (2003), 314-5 (photo); Wirth (1995), 2: 746-7 (photo); Wirth et al. (2004), 256 (photo); Wirth, Hauck & Schulz (2013), 2: 895 & 896 (photos), 897; Moberg & Holmåson (1984), 180 (photo); Stenroos et al. (2011), 373 (photo); Brodo et al. (2001), 573 (photo); Hinds & Hinds (2007), 412 (photo).

Squamules and black apothecia of the lichen Tonina verrucarioides sometimes occur within thalli of P. nigrum.

 
Placynthium nigrum
On limestone rock, Schiehallion, Perthshire, April 2003
 
Placynthium nigrum
On limestone rock, Braemar, Aberdeenshire, April 2003


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Uploaded July 2008, last updated December 2013