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Umbilicaria cylindrica (L.) Delise ex Duby
var. cylindrica


Thallus attached at central point, divided into multiple lobes, grey to brownish-grey above, lacking isidia, lower surface pale brown, with variable complement of often flattened, pale rhizinomorphs (non-attaching rhizines), lobe margins with variable development of fringing, grey-brown cilia, seemingly better developed on lobes without apothecia, thalloconidia absent; apothecia black, somewhat raised, disc with multiply infolded margins (gyrose). Distribution of the species: locally common on exposed rocks and boulders in the north and west, generally upland; the variety evidently widespread within this range.

Refs: Krzewicka (2004), 24 (the species), 26 (the variety); Smith et al. (2009), 915 (for species); Purvis et al. (1992), 618 (for species); Dobson (2005), 436 (description only, for species, photo is var. fimbriata); Dobson (2011), 443 (description only, for species, photo is var. fimbriata); Whelan (2011), 147 (photo, as species); Wirth, Hauck & Schulz (2013), 2: 1120 (photo, the species), 1121; Hansen & Anderson (1995), 67 (photo, as species); Puntillo (1996), plate 41 (photo, as species).

A very variable species, with several named varieties — see Kershaw (1961) and Krzewicka (2004). Var. fimbriata is a distinctive morph, treated separately here, but it probably intergrades with this and other variants. Var. denticulata is also given separate treatment here.

 
Umbilicaria cylindrica var. cylindrica
Umbilicaria cylindrica var. cylindrica
Umbilicaria cylindrica var. cylindrica
Umbilicaria cylindrica var. cylindrica, close view of apothecia
On drystone wall, Lower Glen Shee, Perthshire, August 2008


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Uploaded September 2011, last updated September 2012