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Lichen: Agonimia tristicula

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Squamules of Agonima tristicula.

Squamules of Agonima tristicula. Thanks to Mike Sutcliffe for use of his photo.

Name: Agonimia tristicula (Nyl.) Zahlbr.

Pronunciation: Agonimia tristicula

Conservation Evaluation: Least Concern

Body Type: Squamulose

Squamules of Agonima tristicula, yellow-green when wet.

Squamules of Agonima tristicula, yellow-green when wet.

Description: The thallus is composed of squamules (0.1 to 0.5mm in diameter) that appear dull green to brown when dry and bright green when wet. Crowded in between the squamules are black matt textured barrel-shaped perithecia.

Chemical Tests: No spot test chemical

Nature Notes: Found on walls in crevices, particularly with moss. Likes a variety of rock types including basalt, hard limestone, mortar and a form of metamorphosed limestone called serpentine. Common through Ireland, although it appears missing from a distinctive band down the East coast of Ireland.

Vice county distribution map for Agonimia tristicula: See Map

Link: Map this species on the Lichen Survey

Other species recorded in Ireland:

  • Agonimia allobata (Stizenb.) P.James
  • Agonimia gelatinosa (Ach.) M.Brand & Diederich
  • Agonimia octospora Coppins & P.James

Text and images © Paul Whelan, 2009.