Physcia caesia, known colloquially as blue-gray rosette lichen and powder-back lichen, is a species of foliose lichenized fungus. First described by Georg Franz Hoffmann in 1784, it is common across much of Europe, North America and New Zealand, and more patchily distributed in South America, Asia, Australia and Antarctica. There are 2 subspecies: P. c. caesia and P. c. ventosa, as well as a number of distinct forms and varieties. Molecular studies suggest that the species as currently defined may be polyphyletic.
From Wikipedia, under CC BY-SA 4.0.
Is it poisonous?
We have no record of Blue-gray Rosette Lichen being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.
Easily confused with
- Physcia phaea
- Dirinaria frostii
- Physcia dubia
- Physcia thomsoniana
- Physcia tribacia
- Brodoa intestiniformis
Classification
- Kingdom
- Fungi
- Phylum
- Ascomycota
- Class
- Lecanoromycetes
- Order
- Caliciales
- Family
- Physciaceae
- Genus
- Physcia
- Species
- Physcia caesia
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