LichenIreland
  • Polysporina simplex (Davies) Vězda
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Polysporina simplex
© Mike Simms
Polysporina simplex
© Mike Simms
Polysporina simplex
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(Map updated: 11 August 2009)
 

This is a lichen of granitic rocks, monuments, headstones and chippings. The thallus is barely visible: a thin grey-green smear, but what are of note are the crumpled discs which squeeze in between crevices and cracks. Each disc is small (0.2-1.0mm diam.), rock hard and charcoal black with a thick, crumpled margin and a central umbo (a short stalk) protruding from its centre. It also grows on slaty rocks and along sea cliffs. North, south and south-east Ireland.

Key characteristics

  • A compact mass of black, crumpled discs which creep into cracks and fissures of granitic rocks like a ‘death assemblage’ of little black mites
  • The rounded discs are brittle and the exciple, crenulated like a cog wheel; each disc together with its umbo resembles the upturned cap of a black and wizened button mushroom.

Original text submitted by Vince J. Giavarini

 
 Simms, M. J., (2016). Polysporina simplex (Davies) Vězda. [In] LichenIreland.
http://www.habitas.org.uk/lichenireland/species.asp?item=18955 Accessed on 2018-09-26.