• Collema confertum Arnold
Collema confertum
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This tiny ‘jelly lichen’ requires some skilful searching at its Irish sites in the Burren and the Arran Islands. With a thallus about the size of a one-cent coin, the clues to the identification of this species in the absence of any isidia, the abundant red-black discs and the short radiating lobes with bulbous tips. Spores are short (13-22ųm) and broad (8-12ųm), three-septate to submuriform. It occurs on damp calcareous rocks and boulders. In the Burren, it can be found at the edges of turloughs.

Key characteristics

  • Thallus small, cushion-forming, radiating, packed with discs; the olive-black lobes swollen at the top
  • On damp limestone, and occasionally inundated limestone boulders.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Collema confertum Arnold. [In] LichenIreland. Accessed on 2018-07-17.