• Catillaria chalybeia (Borrer) A.Massal.
Catillaria chalybeia
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This little crustose lichen is a commonly occurring species of siliceous rocks and walls. Brick-built garden walls in urban areas are especially favoured. The small, black discs (to 0.5mm) with a distinct rim, sit on a greenish-grey thallus. It is widespread in Ireland.

Key characteristics

  • The habitat, tiny black discs with a conspicuous rim and colour of the thallus help to distinguish the species
  • Under the microscope the spores with a single division (one-septate) help to place it within Catillaria.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Catillaria chalybeia (Borrer) A.Massal.. [In] LichenIreland. Accessed on 2018-07-19.