Irish lichens

Physcia caesia
Order: Lecanorales       Family: Physciaceae

Species: Physcia caesia

Growth type foliose.
Photos: On rocks and wooden bench. Co. Cork, SW Ireland.

Adpressed, orbicular, pale bluish-grey thallus, convex lobes with small pseudocyphellae. Underside white to tan with scattered rhizines. Abundant farinose or globular soralia with bluish-grey flecks. Black, pruinose apothecia with prominent margins.

Usually occurs on nutrient-rich rocks, tombstones, cement and asphalt. Also found on basic-barked trees.
Cortex and medulla: K+ yellow

Physcia caesia

Physcia caesia
Physcia caesia. December 2008 and May 2012

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