description Physcia caesia Overview
Physcia caesia is a foliose lichen in the family Physciaceae that usually forms small, closely attached rosettes in pale or blue-gray tones. Its upper surface may be white-spotted and bears blue-gray soralia, while black apothecia are uncommon. It is primarily saxicolous, growing on dry or periodically wet rock, including nutrient-enriched sites, and occurs widely across Arctic, boreal, and temperate regions.
help Physcia caesia FAQ
What does Physcia caesia look like?
Physcia caesia is a small foliose lichen forming closely attached pale gray or blue-gray rosettes. Its upper surface often has white spotting and blue-gray soralia, while black apothecia are uncommon.
Where does Physcia caesia grow?
It is primarily saxicolous, meaning it grows on rock and other hard mineral surfaces. Records include nutrient-enriched rocks, tombstones, asphalt, and asbestos-cement surfaces.
How can Physcia caesia be separated from Physcia aipolia?
Physcia caesia usually has blue-gray soralia and rarely bears black apothecia. Physcia aipolia is more often associated with frequent black apothecia and commonly grows on trees rather than exposed rock.
What are soralia in Physcia caesia?
Soralia are powdery structures that produce soredia, small reproductive propagules containing fungal and algal partners. In Physcia caesia they commonly appear as rounded blue-gray or pale powdery patches on the thallus.
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