Images of British Lichens
Degelia ligulata P.M.Jørg. & P.James
Thallus yellow-grey to blue-grey, presumably dark blue when wet, marked above with longitudinal striations, lobes very slightly undulate-ridged, felted blue-black beneath and at the margins, lobe margins lacking isidia but with numerous, flat phyllidia (detaching lobe fragments); apothecia very rare, said to be red-brown to dark brown or blackish. Very local and scarce in western Britain and Ireland, in sheltered places in coastal rock crevices and on tree-bases, though no doubt under-recorded on inaccessible cliff-faces. Probably, as suggested by James & Purvis (in Purvis et al., 1992), dependent on onshore sea mists. [In some descriptions, the phyllidia are termed "schizidia", but this appears incorrect.]
British Red Data Book species: vulnerable.
Refs: Smith et al. (2009), 370; Purvis et al. (1992), 231; Whelan (2011), 91 (photo); Lichen Atlas of the British Isles 4: 1597 (1999).
D. atlantica is similar but instead of flat, scale-like phyllidia, it has rounded or knobbly isidia along the lobe margins. The two species can occur together, but D. atlantica is by far the more common species.
|In sheltered cleft in seacliff, Isle of Muck, June 2012 (BLS meeting), lowest photograph showing a closer view of the marginal phyllidia.|
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Uploaded July 2012, updated January 2016