• Lecanora semipallida H. Magn. (1940)
Lecanora semipallida
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(Map updated: 11 August 2009)

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 2019-01-21.