• Thermutis velutina (Ach.) Flot.
Thermutis velutina
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(Map updated: 11 August 2009)

Recorded just once in Ireland from County Galway, Thermutis is an ephemeral ‘will-o-the-wisp’ species of watery gullies fed by calcareous seepage and low, dapple-shaded river boulders. The thallus is a fine mesh of brown-black fungal filaments (Scytonema) forming little pads surmounted by near-translucent pore-capped discs, without which the species is impossible to identify. Even after collection, the discs are difficult to preserve intact. It is a real test of field skill to ever track it down.

Key characteristics

  • Short-lived lichen with a soft, thickish filamentous thallus; wet mountain gullies and bouldery stretches of rivers
  • Discs tiny like a drop of jelly, rather bloated, semi-translucent with a pore at the top.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Thermutis velutina (Ach.) Flot.. [In] LichenIreland. Accessed on 2019-05-26.