Opegrapha gyrocarpa Roccellaceae
Gyrographa gyrocarpa (Opegrapha gyrocarpa)

Growth type crustose
Soralia K-, C+ red, KC+ red, P-, UV+ glaucous or pale yellow

Found on shaded neutral or siliceous rocks, often on old dry-stone walls and on rocks in old woodland. Sometimes host to Sphinctrina turbinata

Thin or finely cracked pale brown to reddish-brown thallus, sometimes with pinkish patches. Dark-brown to black prothallus. Yellowish soralia scattered over surface giving flecked appearance. Occasional scattered knot-like or gyrose apothecia, spores 3-septate 17-25 x 4-6 Ám. Thallus can form extensive mosaics. Microscope photograph below.

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

Opegrapha gyrocarpa

Opegrapha gyrocarpa

Microscope photograph
Opegrapha gyrocarpa, spores
Opegrapha gyrocarpa
Lychett Matravers and Colehill, Dorset. January 2014, 2017

All images used are copyright. Please contact me if you find errors.