• Thelenella modesta (Nyl.) Nyl.
Thelenella modesta
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(Map updated: 11 August 2009)

This is an extremely rare crustose epiphyte of isolated parkland trees and trees of the wayside. It has been in decline in Britain for decades and is a rarity also in Ireland with six preľ1970 records. There are few lichenologists alive that have seen its pink-yellow-brown, thickly warted thallus. In the herbarium, it tends to fade to grey and in this condition it may resemble Pertusaria pertusa (described elsewhere). However, T. modesta differs in its muriform spores, four-to eight-spored asci and lack of chemistry, that is, negative spot tests.

Key characteristics

  • Thallus of living specimens pink or yellow-brown with wart-like discs
  • No lichen substances, spores four to eight/ascus, muriform.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Thelenella modesta (Nyl.) Nyl.. [In] LichenIreland. Accessed on 2019-01-19.