Hericium flagellum is a species of fungus in the family Hericiaceae[1] native to Europe, first described by Giovanni Antonio Scopoli, and placed into its current genus by Christiaan Hendrik Persoon in 1797.

It was confirmed—using sexual incompatibility studies—to be a distinct species from H. coralloides in 1983.

Found in montane areas, typically on newly fallen trunks and stumps of fir (Abies species), especially silver fir[2] with one study finding over half of recorded specimens growing on silver fir deadwood in high conservation value areas.

[3] Spores are 5–6.5 by 4.5–5.5 μm.

[4][5]