''Bryostigma epiphyscium'' is a species of

lichenicolous fungus A lichenicolous fungus is a member of a specialised group of fungi that live exclusively on lichens as their host organisms. These fungi, comprising over 2,000 known species across 280 genera, exhibit a wide range of ecological strategies, includ ...

in the order

Arthoniales The Arthoniales is the second largest order of mainly crustose lichens, but fruticose lichens are present as well. The order contains around 1500 species, while the largest order with lichenized fungi, the Lecanorales, contains more than 14000 s ...

. Formerly classified in the genera ''

Arthonia ''Arthonia'' is a genus of lichens in the family Arthoniaceae. It was circumscribed by Swedish botanist Erik Acharius in 1806. It is a genus of thin crustose lichen of widely varying forms, commonly called comma lichens.Field Guide to California ...

'' and '' Conida'', it was transferred to the genus '' Bryostigma'' in 2020. It is known to infect the lichen '' Physcia caesia'' and other lichens of the genus ''

Physcia ''Physcia'' is a genus of lichen-forming fungi in the family Physciaceae. The widely distributed genus contains about 80 species. The genus is cosmopolitan distribution, cosmopolitan, and has been extensively studied in various regions in the p ...

''.

References

Arthoniomycetes Fungi of Iceland Fungi described in 1875 Taxa named by William Nylander (botanist) Lichenicolous fungi Fungus species {{Arthoniomycetes-stub