LichenIreland
  • Placynthium tremniacum (A.Massal.) Jatta
Placynthium tremniacum
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.

 

Like P. nigrum but thallus often white pruinose, very small (<3cm diam.) and composed of coralloid granules (not squamules). Prothallus poorly developed at the base of the crust; spores persistently one-septate. It grows on damp, shaded hard limestones. In Ireland, the species is known only from Clare.

Key characteristics

  • Like P. nigrum but thallus smaller, more granular in composition and often with a whitish frosting
  • On hard limestone in damp, shady places.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Placynthium tremniacum (A.Massal.) Jatta. [In] LichenIreland.
http://www.habitas.org.uk/lichenireland/species.asp?item=19349 Accessed on 2017-10-20.