• Phaeophyscia sciastra (Ach.) Moberg
Click on the image to enlarge it in a new window
Phaeophyscia sciastra
© Mike Simms
Phaeophyscia sciastra
Click on map to open large map in new window
(Map updated: 11 August 2009)

This rare species should be searched for on nutrient-rich rocks and boulders by lakes and rivers. From above, this species is easy to dismiss as P. orbicularis, but look closely at the lobes and at the absence of any orange pigmentation of the thallus. Then pay attention to the clusters arising from the lobes and spread across the thallus as these are not powdery soralia but clusters of fine brownish isidia. It is known from Connemara, County Galway and from County Donegal.

Key characteristics

  • Orange pigmentation absent; thallus to 5cm diam.
  • Lobe edges and centre of thallus with clusters of brown isidia; lake and river margins; underside black.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Phaeophyscia sciastra (Ach.) Moberg. [In] LichenIreland. Accessed on 2018-12-12.