• Diplotomma alboatrum (Hoffm.) Flot.
Diplotomma alboatrum
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(Map updated: 11 August 2009)

This is an abundant, shade-tolerant species of man-made, calcareous habitats, such as vertical limestone walls, mortar and limestone headstones. The small, chalky thallus covered with tiny black discs (to 1mm diam.), glazed over with an icing of pruina is distinctive. It may also occur on the enriched bark of basic trees such as ash.

Key characteristics

  • The pruinose discs on a chalky-white thallus immediately indicates this species
  • It reacts negative to all reagents.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Diplotomma alboatrum (Hoffm.) Flot.. [In] LichenIreland. Accessed on 2019-06-25.