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Lichen: Acrocordia macrospora

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Name: Acrocordia macrospora A.Massal.

Pronunciation: Acrocordia macrospora

Acrocordia macrospora - the black dots are its perithecia - with the foliose thallus of Anptychia runcinata growing down over it.

Acrocordia macrospora - the black dots are its perithecia - with the foliose thallus of Anaptychia runcinata growing down over it.

Acrocordia macrospora under the microscope showing an ascus with the 1-septate spores encased.

Acrocordia macrospora under the microscope showing an ascus with the 1-septate spores encased.

Body Type: Crustose

Conservation Evaluation: Least Concern, Nationally Scarce.

Description: The large black dots are perithecia; they range in size from 0.8 mm to 1 mm in diameter. The perithecial pore is prominent and circular. The thallus is visible and is grey to light-brown in colour. Spores are colourless and 1-septate.

Acrocordia macrospora with a clear view of some 1-septate spores.

Acrocordia macrospora with a clear view of some 1-septate spores.

Chemical Tests: All negative.

Nature Notes: This is a coastal lichen found in sheltered and shaded  areas of the shore. Its substrate tends to be silica-poor to calcareous rocks.

Vice county map for Acarospora macrospora: See map.

map-acrocordia-macrospora

Link: Map this species on the Lichen Survey

Other species recorded in Ireland:

  • Acrocordia conoidea (Fr.) Körb.
  • Acrocordia gemmata (Ach.) A.Massal.
  • Acrocordia salweyi (Leight. ex Nyl.) A.L.Sm.

Text and images © Paul Whelan, 2009.