Irish lichens

Fuscidea lygaea

Order: Incertae sedis       Family: Fuscideaceae

Species: Fuscidea lygaea

Growth type crustose.
Photos: On acidic rock. Gougane Barra, Cork, SW Ireland.
Specimen left and immediately below identified by John Douglass

Variable. Pale to dark greyish-brown or brown thallus, often purple-tinged. Thin, +/- even, smooth and continuous or +/- cracked into minute areoles. Prothallus is dark brown to black. Black apothecia with flat discs that become convex, excluding margins.
Chemical reactions negative.

Common on hard, siliceous, upland rocks, most frequent in western and northern Ireland.

Similar: Fuscidea cyathoides. K+ dirty yellow, UV-
Fuscidea kochiana. UV+ blue-white.

Fuscidea lygaea

Fuscidea lygaea

Fuscidea lygaea. August 2009

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