Irish lichens

Order: Agyriales       Family: Schaereriaceae

Species: Schaereria fuscocinerea

Growth type crustose.
Photos: On coastal rock. Seal Harbour, Co. Cork, SW Ireland.
Identification very uncertain:
Photographs are probably of
Rhizocarpon richardii

Smooth thallus with grey-brownish to dark brown, sharp-angled areoles surrounded by black prothallus. Thallus sometimes +/- blackish in exposed locations. Small black apothecia are initially immersed, concave and spot-like, becoming convex.

Mainly western Ireland on exposed hard siliceous rocks.
K-, C+ pink, KC-, P- UV-. The C+ pink reaction can be variable.

September 2009

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