B. borbonicum B. radiatum B. sulphuratum B. vibrans Boreostereum is a genus of corticioid fungi.
The genus was circumscribed in 1968 by Erast Parmasto to contain the type species, which was formerly known as Stereum radiatum.
[2] Species in the genus have a dimitic hyphal system, and the hyphae have with brown encrustations that turn greenish when potassium hydroxide is applied.
[3] Boreosterum vibrans produces vibralactones, chemical metabolites that inhibit various enzymes.
[4][5] Recent phylogenetic research indicates that Boreostereum is a sister group to the rest of the Gloeophyllales.