LichenIreland
  • Verrucaria praetermissa (Trevis.) Anzi
Verrucaria praetermissa
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(Map updated: 11 August 2009)

This common aquatic species with a pale green-grey, almost white-grey when dry, cracked thallus (smoother when young), has its immersed discs (perithecia) barely projecting above the surface; the tip of the disc is only visible as a pink or brown dot. Spores two to three times longer than wide; main range 1825m long. It occurs on acid and calcareous rocks of both river and lake margins. It is tolerant of shade; throughout Ireland. Care needs to be taken not to confuse with some forms of V. aethiobola (for example, V. csernaensis).

Key characteristics

  • Aquatic lichen; thallus pale green, cracked with immersed discs, the tops just visible
  • Spores simple, two to three times longer than wide.

Original text submitted by Vince J. Giavarini

 
 Simms, M. J., (2016). Verrucaria praetermissa (Trevis.) Anzi. [In] LichenIreland.
http://www.habitas.org.uk/lichenireland/species.asp?item=20703 Accessed on 2018-10-18.