Phellodon secretus is a rare species of tooth fungus in the family Bankeraceae, described in 2003. The fungus has a distinctive growth habit, typically emerging in sheltered spaces beneath fallen pine trunks or rootstocks with only a few centimetres of gap between the soil and decayed wood. Its small, slender fruit bodies feature thin, cottony soft caps that are initially white with an ash-grey tint, becoming darker with age, and bear slender white to greyish spines on their underside. Originally found in old-growth pine woodlands in Finland, the species has since been recorded in England and detected through environmental DNA in several other countries, suggesting a wider Holarctic distribution.

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