• Collema polycarpon Hoffm.
Collema polycarpon
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This blackish, tidily organised ‘jelly lichen’ often forms small rosettes (2-6cm diam.) over the surfaces of hard limestones. The lobes are thick, raised up in the centre and radiating but neatly spaced — almost overlapping or superimposed one on another — and unusually rich in discs (0.5-1.5mm diam.) which stand proud of the thallus. There are no isidia. Frequent in the west and central Ireland; rare elsewhere.

Key characteristics

  • Thallus usually of small rosettes (<7cm diam.), the lobes, thick, radiating, gently touching and crammed with discs towards the ends
  • On hard limestones generally.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Collema polycarpon Hoffm.. [In] LichenIreland. Accessed on 2018-08-14.