• Hymenelia prevostii (Duby) Kremp.
Hymenelia prevostii
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Look out for this crustose lichen growing on limestone, both naturally occurring and in churchyards. It has a pale, cream-brown thallus with tiny discs set into pits (to 0.5mm diam.). The distinctive discs are pink to pink-brown. When dry, they shrink within the pit to leave a thin gap around the edge. The spores are near-globose. The thallus does not scratch orange with a fingernail as in Ionaspis epulotica. In Ireland, it occurs from the Burren northwards; it is absent in the south.

Key characteristics

  • Creamy thallus with pink discs; does not scratch orange with fingernail
  • Discs become looser on drying but are translucent when wet; on lightly sheltered, horizontal limestone.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Hymenelia prevostii (Duby) Kremp.. [In] LichenIreland. Accessed on 2018-08-16.