Previous page Next page

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.


Degelia ligulata
Degelia ligulata
Degelia ligulata, enlarged view showing schizidia
In sheltered cleft in seacliff, Isle of Muck, June 2012 (BLS meeting), lowest photograph showing a closer view of the marginal phyllidia.

Previous page   Next page

Lichens HOME PAGE | Index of Species | Conditions of Use and e-mail contact | References | Site Home Page

© A.J. Silverside
Uploaded July 2012, updated January 2016