| Acarospora stapfiana | |
|---|---|
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Acarosporales |
| Family: | Acarosporaceae |
| Genus: | Acarospora |
| Species: | A. stapfiana
|
| Binomial name | |
| Acarospora stapfiana (Müll.Arg.) Hue (1909)
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| Synonyms | |
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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.