• Byssoloma marginatum (Arnold) Sérus.
Byssoloma marginatum
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This is a lichen of tree bole mosses and tree bole crevices in humid districts of western Ireland. B. marginatum has a greenish-white, thinly-powdery thallus. Discs (0.3-0.7mm diam.) are brown to black, often with a bluish tinge and with a prominent, raised, non-woolly edge (exciple). The spores are three-septate. In Ireland, there are a few records from the north.

Key characteristics

  • Discs without ‘woolly’ exciple; with a slight bluish tinge; spores three-septate
  • Low down on tree bole crevices spreading to mosses; humid woods.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Byssoloma marginatum (Arnold) Sérus.. [In] LichenIreland. Accessed on 2018-08-16.