Plant Family
Fomitopsidaceae
The brown-rot brackets — woody conifer polypores whose lanostane triterpenes are both their medicine and their toxicity.
Woody bracket fungi that rot wood from the inside out, leaving the brown lignin behind. Medicinally they run on lanostane triterpenes rather than the β-glucans of the culinary mushrooms.
4 Notable Members
Overview
The Brown-Rot Bracket Family
These are the shelf and hoof fungi of standing timber — tough, perennial or annual brackets that grow on living and dead trees, mostly conifers. The family is defined by what it does to wood: brown rot. Where the white-rot fungi break down lignin and leave pale, stringy residue, the brown-rot fungi digest cellulose and hemicellulose and leave the lignin behind as a dark, crumbling, cubically cracked mass.
That distinction is not merely mycological housekeeping. It shapes the chemistry, and therefore the medicine. The Fomitopsidaceae are not a β-glucan family in the way the culinary mushrooms are; their pharmacology runs on lanostane triterpenes, and the bitterness of a dried conk is a fair guide to its chemistry.
Shared Traits
How to Recognise It
In Practice
Medical Significance
The family’s medical reputation is old and specific. Agarikon was Agaricum to Dioscorides, who called it an elixir of long life, and it remained in European pharmacy for centuries as an antihidrotic for the night sweats of tuberculosis — an application resting on its principal triterpene, agaric acid. Modern interest is narrower and almost entirely in vitro: antiviral screening of old-growth Fomitopsis officinalis strains.
Chicken of the woods was once placed here. The 2017 family-level classification of the Polyporales puts it in its own family, the Laetiporaceae.
The honest summary for the family is that its traditional standing is considerably older than its evidence, and that no member has a controlled human trial behind it.
The triterpenes that define the family are not benign. Agaric acid (agaricin) is genuinely toxic — a mitochondrial ATP-carrier inhibitor, and the reason agarikon was dosed in fractions of a gram rather than as a tea. Substrate matters too, since brackets growing on yew or other toxic hosts should be avoided. Identification is the first safety step: brown-rot brackets are woody, variable and easily confused.
Phytochemistry
Characteristic Chemistry
The signature class is the lanostane triterpene, and it is shared across the family with enough consistency to act as a chemical marker: eburicoic acid occurs in agarikon, alongside dehydroeburicoic acid, dehydrotrametenolic acid, trametenolic acid B, officinalic acid and agaric acid. Ergosterol and ergosterol peroxide are present as in most fungi.
β-Glucans are present but are not the family’s therapeutic story.
Beyond the Database
Also in This Family
Notable members without a monograph yet.
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