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Lichen: Calicium viride

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Individual apothecia showing the pin-head shape.

Individual apothecia showing the pin-head shape.

Cluster of apothecia.

Cluster of apothecia.

Overview, note the green thallus.

Overview, note the green thallus.

VC map, Calicium viride.

VC map, Calicium viride.

Name: Calicium viride Pers.

Pronunciation: Calcium viride

Conservation Evaluation: Least Concern
Body Type: Crustose – granular

Description: This is a tiny pin-head lichen. The heads or apothecia are black and less than 2mm high. The thallus is verdigris green, sometimes with a sulphurous tint. The underside of the apothecia may be pruinose. The thallus may be partially immersed in the substrate.

Chemical Tests: All negative, UV+.
Nature Notes: Found on acid trees, conifers and oak for example, hidden in dry crevices. Typical of coniferous woodlands.

Vice county distribution map: See Map
Link: Map this species on the Lichen Survey
Other species recorded in Ireland:

  • Calicium abietinum Pers.
  • Calicium diploellum Nyl.
  • Calicium glaucellum Ach.
  • Calicium lenticulare Ach.
  • Calicium quercinum Pers.
  • Calicium salicinum Pers.

Text and images © Paul Whelan, 2009.