• Lecanora semipallida H. Magn. (1940)
Lecanora semipallida
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.


Formerly named L. xanthostoma or L. flotowiana this lichen which belongs to the L. dispersa complex, has a dirty dark-grey to black endolithic (immersed) thallus and slightly frosted grey-brown discs with a thick, faintly notched white disc margin. It grows on calcareous rocks. All candidate discs should be spot tested, especially the disc margins which in this species react K+ yellow, UV+ yellow to bright orange. In Ireland, the species is present in central and southern regions.

Key characteristics

  • Near black thallus sprinkled with white-edged pale brown discs which stand out against the background; on hard limestones
  • The thick white disc margins test K+ yellow, UV+ yellow to bright orange.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Lecanora semipallida H. Magn. (1940). [In] LichenIreland. Accessed on 2018-08-16.