• Caloplaca ulcerosa Coppins & P James
Caloplaca ulcerosa
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(Map updated: 11 August 2009)

This is a characteristic species of old, bruised but well-illuminated sycamores in wayside situations in towns or smaller settlements. It has a grey-white thallus sprinkled with yellow-green, powdery soralia arising from blister-like craters on the surface. The vivid-orange discs (to 0.6mm diam.) begin as small piercing dots of orange then develop into convex fruits. Found mostly on dust-impregnated, basic-barked trees by waysides; also in former parklands. In Ireland, the species is rather local.

Key characteristics

  • Thallus grey-white with scattered yellow-green soredia emerging from blister-like craters within the bark; discs striking, vivid orange
  • On old, battered or partially hollowed-out sycamores or other dust-enriched wayside trees.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Caloplaca ulcerosa Coppins & P James. [In] LichenIreland. Accessed on 2019-05-25.