Physcia caesia Physciaceae
Physcia caesia

Growth type foliose
Chemical results: Cortex and medulla K+ yellow

On basic, well-lit nutrient-rich rocks, cement and asphalt. Also found on basic-barked trees.

The pale bluish-grey thallus has adpressed convex lobes with small pseudocyphellae. Underside white to tan with scattered rhizines. Abundant blue-grey farinose or globular soralia, mainly laminal. The black, pruinose apothecia with prominent margins are rare.

Similar: Phaeophyscia orbicularis has greenish soralia.
Physcia dubai. Pseudocyphellae and cilia absent, acidic substrates


Physcia caesia


Physcia caesia


Physcia caesia


Physcia caesia, fertile
Physcia caesia
Corfe Mullen and Sturminster Marshall, Dorset. January and March 2014

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