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Previously
Neofuscelia pulla
. Growth type foliose.
Photos: Rock Island, Co. Cork.
Identification confirmed by John Douglass
Large grey-brown to dark-brown thallus with +/- adpressed lobes not widening at apices, faintly reticulate. Underside black with sparse rhizines, tan towards edges. Dark-brown apothecia are usually present, the entire margins becoming thin and distorted. Isidia are absent. Asci 8-spored, spores simple, 5.5-14 x 3.5-8 µm.
Micro photo
below.
Usually coastal on well-lit siliceous rocks above HWM. Medulla K-, C+ pinkish-red, KC+ pinkish-red, P-, UV+ white but the chemical reactions can be variable.
Microscope photograph
Xanthoparmelia pulla
Rock Island, Co. Cork. January 2012