Irish lichens

Opegrapha gyrocarpa

Order: Arthoniales       Family: Roccellaceae

Species: Gyrographa gyrocarpa (Opegrapha gyrocarpa)

Growth type crustose.
Photos: On shaded acidic rock. Gougane Barra, Cork, SW Ireland.

Thin or finely cracked pale brown to deep reddish-brown thallus, sometimes with pinkish patches. Dark-brown to black prothallus. Yellowish soralia are scattered over the surface giving a flecked appearance. Knot-like or gyrose apothecia are occasional, usually scattered. Can form extensive mosaics.

Occurs on humid, shaded, neutral or siliceous rocks, often in old woodlands or on old dry-stone walls.
Soralia K-, C+ red, KC+ red, P-, UV+ glaucous or pale yellow

Similar: Belonia nidarosiensis. On limestone, mortar, cement. C-

Opegrapha gyrocarpa

Opegrapha gyrocarpa

Opegrapha gyrocarpa
Opegrapha gyrocarpa. August 2009

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