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Lichen: Degelia plumbea

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Name: Degelia plumbea (Lightf.) P.M.Jørg. & P.James (1990)
Pronunciation:

Name: Degelia plumbea (Lightf.) P.M.Jørg. & P.James (1990)

Pronunciation: Degelia plumbea

Conservation Evaluation: Least Concern, International Responsibility.

Degelia plumbea showing the reddish-brown abundant apothecia.

Degelia plumbea showing the reddish-brown abundant apothecia.

Body Type: Foliose

Description: The thallus is large (up to 10cm diameter) with a distinctive blue-grey colour. The marginal lobes have crescent-shaped rings that look superficially like growth rings. The underside has a well developed hypothallus that appears ‘furry’ and protrudes just beyond the margin of the uppersurface. There are no isidia. The brown-red apothecia (=< 1mm diameter) are usually abundant, especially towards the centre of the thallus.

The furry undersurface or hypothallus often protrudes.

The furry undersurface or hypothallus often protrudes.

Chemical Tests: All negative

Nature Notes: Likes well lit areas of woodland and scrub. Found on basic bark, typically on hazel in the West of Ireland. Sometimes found near the sea on silica-poor rocks. Similar looking species are Degelia atlantica and Pannaria rubiginosa.

Overview of a complete thallus about 10cm in diameter.

Overview of a complete thallus about 10cm in diameter.

Vice County Distribution: See map.

Vice county distribution map

Vice county distribution map

Link: Map this species on the Lichen Survey

Other Degelia recorded in Ireland:

  • Degelia atlantica (Degel.) P.M.Jorg. & P.James
  • Degelia ligulata P.M.Jorg. & P.James

Text and images © Paul Whelan, 2009.