Acarospora stapfiana

Corn Pops, a reference photo
Photo: Jason Hollinger · CC BY 2.0 (licence)

Acarospora stapfiana, the hoary cobblestone lichen, is a lichenicolous (lichen-dwelling) lichen species in the family Acarosporaceae. It is known for its parasitic relationship with members of the genus Caloplaca. The species has a unique life cycle in which it starts as a juvenile non-lichenised fungus before forming a fully lichenised thallus. It is found in Asia and North America, where it grows on calcareous rocks.

From Wikipedia, under CC BY-SA 4.0.

Is it poisonous?

We have no record of Corn Pops 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

Classification

Kingdom
Fungi
Phylum
Ascomycota
Class
Lecanoromycetes
Order
Acarosporales
Family
Acarosporaceae
Species
Acarospora stapfiana

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