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Umbilicaria polyrrhiza (L.) Fr.


Thallus attached at central point, usually divided into multiple lobes, smooth and coppery- to dark brown above, lacking isidia, lower surface black, margins, lower surfaces and also cracks in the thallus all clothed with projecting, abundant, branched, black rhizinomorphs (non-attaching rhizines), the marginal rhizinomorphs with thalloconidia often present on their tips; apothecia rare. Locally common on exposed rocks and boulders in the north and west.

Refs: Krzewicka (2004), 61; Smith et al. (2009), 917; Purvis et al. (1992), 619; Dobson (2005), 437 (photo); Dobson (2011), 444 (photo); Jahns (1983), 230-231 (photo); Wirth (1995), 2: 930, 937 (photo); Wirth, Hauck & Schulz (2013), 2: 1123, 1127 (photo); Moberg & Holmåson (1984), 156 (photo); Holien & Tønsberg (2008), 102 (photo); Stenroos et al. (2011), 468 (photo); Valcárcel et al. (2003), 366-7 (photo); Puntillo (1996), plate 41 (photo).

Umbilicaria polyrrhiza
Umbilicaria polyrrhiza, enlarged view
With other Umbilicaria spp. on exposed, siliceous, glacial-erratic, moorland boulder, Loch Eriboll, West Sutherland, July 2012
 
Umbilicaria polyrrhiza
Umbilicaria polyrrhiza, closer view
On montane rocks, Glencoe, Argyllshire, April 2009


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Uploaded September 2011, last updated September 2013