• Polysporina simplex (Davies) Vězda
Click on the thumbnails to enlarge the images
Polysporina simplex
© Mike Simms
Polysporina simplex
© Mike Simms
Polysporina simplex
Click on map to open large map in new window
(Map updated: 11 August 2009)

Click here to view an interactive map of the Northern Ireland dataset as currently collated by CEDaR.
The map is generated through the NBN Gateway using their Interactive Mapping Tool.


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. Accessed on 2018-08-16.