North Macedonia, Morocco, Bulgaria, Croatia, Slovenia, France (processing)
Pyramid
Base
Wet bark, turned earth, the underside of a fallen log in November. A dark green-brown smell that is less a note than a structural material — the load-bearing wall of the chypre accord. Without it, an entire fragrance architecture collapses into decoration.
Dark, damp, green-brown. Phenolic and astringent — closer to wet tree bark than to anything floral. A leathery bitterness underneath, with a faint marine-iodine edge that reads almost like seaweed on rock. Drier and more angular than patchouli, which tends sweet; sharper than vetiver, which tends smoky. At distance it smells like a temperate forest after rain. Up close, the tarry, almost medicinal phenolic quality dominates. The dry-down is long, woody-mossy, with a persistent bitter-green residue that clings to fabric.
Evolution over time
Immediately
Immediately
Dark green, damp, phenolic — wet bark and crushed lichen. A brief marine-iodine flash, almost briny, before the earthy body takes over.
After a few hours
After a few hours
The phenolic sharpness recedes. What remains is dry, leathery-mossy warmth, an earthy bitterness like turned soil. The iodine facet disappears. The texture thickens.
After a few days
After a few days
Persistent woody-green residue on fabric and skin. Faint, dry, mossy — a bitter-green ghost that outlasts most other base notes. The phenolic edge is gone; only the structural skeleton remains.
The Full Story
Oakmoss is a lichen, not a moss. Evernia prunastri is a symbiotic organism — fungus wrapped around algae — that colonises oak bark, conifers, and stone walls across the temperate northern hemisphere. The bulk of commercial harvest comes from North Macedonia, Morocco, and the Balkans (Bulgaria, Croatia, Slovenia). France, specifically Grasse, is where the raw lichen is processed into absolute, but contributes little to cultivation.
The smell: earthy, damp, phenolic. Composted green — not the bright green of a crushed leaf but the dark green of bark that has been rained on for weeks. There is a leathery undertone, a faint iodine-seaweed quality, and a persistent bitterness. Drier than patchouli, less sweet than vetiver, more astringent than either. At low doses it reads as forest floor; at higher concentrations the tarry, phenolic character takes over.
Oakmoss absolute defined the chypre accord — the bergamot / floral heart / mossy-labdanum base triangle that François Coty formalised in 1917 and that generated an entire fragrance family. EU Regulation 2017/1410 changed everything. Atranol (CAS 526-37-4) and chloroatranol (CAS 57074-21-2) — degradation products formed during extraction, and potent skin sensitisers — were banned outright in finished cosmetic products, with enforcement from August 2019. IFRA's 43rd Amendment allows oakmoss extracts only if atranol and chloroatranol are each below 100 ppm, at a maximum use level of 0.1% in the finished product.
The primary synthetic workaround is Evernyl (methyl 2,4-dihydroxy-3,6-dimethylbenzoate, CAS 4707-47-5) — also called atraric acid or methyl β-orcinolcarboxylate — a dry, powdery-mossy molecule that captures the phenolic character without the allergens. Modern chypres typically combine Evernyl with small doses of IFRA-compliant treated oakmoss absolute and treemoss (Pseudevernia furfuracea, CAS 90028-67-4) to approximate the pre-regulation effect. The approximation is competent. It is not the same thing.
Atranol and chloroatranol — the molecules that triggered oakmoss regulation — are not originally present in the living lichen. They are degradation products of atranorin and chloroatranorin, formed during the extraction process itself. The act of turning oakmoss into a perfumery material creates the allergens that restrict its use.
Extraction & Chemistry
Extraction method: The dried lichen is macerated in water at room temperature for one to three days to soften and swell the thallus. Extraction follows with three successive washes in a mixture of cyclohexane and isopropanol (not hexane, as sometimes reported). The concrete is recovered after solvent evaporation; the absolute is obtained by washing the concrete with ethanol. Yield: approximately 1% — roughly 100 kg of raw lichen produces 1 kg of absolute. Supercritical CO2 extraction produces cleaner, lower-allergen versions but at reduced yield and higher cost. IFRA-compliant grades undergo additional treatment to reduce atranol and chloroatranol below 100 ppm each, further reducing usable yield.
Heavily restricted. Oakmoss absolute is IFRA-limited due to atranol and chloroatranol content (potent skin sensitizers). Only atranol-free qualities are permitted in modern formulations.
Synonyms
OAK MOSS · MOUSSE DE CHÊNE · EVERNIA PRUNASTRI · EICHENMOOS
Physical Properties
Odor Strength
Medium
Lasting Power
400 hours at 20.00%
Appearance
dark green brown semi-solid
Flash Point
> 200.00 °F. TCC ( > 93.33 °C. )
Specific Gravity
0.97100 to 0.98300 @ 25.00 °C.
Refractive Index
1.47600 to 1.48700 @ 20.00 °C.
In Perfumery
Oakmoss is the structural base of two fragrance families: the chypre (bergamot, floral heart, oakmoss-labdanum base) and the fougère (lavender, coumarin, oakmoss). In the chypre, it is not a note — it is the architecture. Remove it and the accord falls apart. It functions as a fixative, extending the life of volatile citrus and floral materials, and as a textural anchor, giving body and darkness to compositions that would otherwise read as thin. Post-regulation, the oakmoss effect is reconstructed using Evernyl (CAS 4707-47-5), the main synthetic substitute, combined with IFRA-compliant treated oakmoss absolute (atranol and chloroatranol each below 100 ppm) and treemoss absolute (Pseudevernia furfuracea). Vetiveryl acetate and patchouli heart fractions are sometimes layered in to restore the earthy depth that treated absolutes lose during allergen-stripping.
