Phaeophyscia orbicularis Physciaceae
Phaeophyscia orbicularis

Orange-yellow patches on cortex and soredia K+/- purple. Medulla: K-

Common on nutrient-rich bark, twigs, stones and on concrete and roads.
Occasionally host to Arthonia phaeophysciae

Pale grey to brownish-grey orbicular thallus, becoming green when wet. Long, divided lobes with black undersides and dark, protruding rhizines. Laminal and marginal dense creamy-greenish soralia, mottled bluish-black. Apothecia occasional, spores brown, 1-septate, 17-26 x 7-11 Ám.
Microscope photograph below.

Similar: Hyperphyscia adglutinata. Under surface white with few rhizines.
Physcia caesia, larger globose soralia and Physcia tribacioides


Phaeophyscia orbicularis


Phaeophyscia orbicularis


Phaeophyscia orbicularis


Phaeophyscia orbicularis

Microscope photograph
Phaeophyscia orbicularis
Phaeophyscia orbicularis
Dorset. 2012-2014

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