Wood blewit

Clitocybe nuda is one of the most immediately recognisable edible fungi in temperate woodland owing to its vivid colouration.

Cap

The cap reaches 6-15 cm in diameter and passes through several phases. In youth it is convex and deeply inrolled at the margin, intensely violet-blue all over.

With age it flattens, the margin unfurls and often becomes wavy and lobed, and the colour shifts from violet through lavender to a warm buff-tan in dry conditions - yet a slight lilac wash usually persists, especially toward the margin.

The surface is completely bare (hence 'nuda'), smooth, and subtly greasy when wet. Critically, the colour is hygrophanous: a single cap may appear strongly violet on one side (where rain has fallen) and pale biscuit on the other, so always examine the cap from multiple angles.

Gills

The gills are crowded and beautifully uniform lilac to blue-violet when fresh, gradually losing colour to pinkish-buff as the spores mature. They are notched where they meet the stem (sinuate).

Spore print pale pink to pinkish-buff; spores minutely roughened under the microscope.

Stem

The stem is stocky, often widened or club-shaped at the base, and coated in fine silky fibrils that give it a sheen. It remains stubbornly violet-lilac even when the cap has faded.

Flesh

The flesh is white or barely lilac, firm, and unchanging.

Smell & taste

The smell is highly distinctive: a sweet, floral, slightly citrus-perfume aroma frequently likened to frozen orange juice, lavender, or aniseed - this fragrance is one of the best field aids.

Wood blewit is a saprotrophic decomposer that processes leaf litter, rotting wood fragments, compost, and organic debris in soil. It does not form mycorrhizal associations.

The species thrives wherever deep, moist, nitrogen-rich litter accumulates:

• under beech, oak, ash, or hornbeam in broadleaf woodland
• along hedgerows
• in old orchards
• in garden compost heaps (sometimes spectacularly productive)
• on wood-chip mulch paths
• in parkland lawns where leaf litter has built up around trees

It is less common in pure conifer stands, though it will occur in mixed woods.

Fairy rings and partial arcs form when the mycelium has fully colonised an area and continues expanding outward, often revealing the previous years' positions as concentric rings of old caps.

Late autumn to early winter is the defining window: October through December in most of temperate Europe, with peaks in November.

Blewits are famous for tolerating light frosts - they routinely fruit through the first sharp autumn frosts that kill most other fungi, and a brief hard freeze followed by a thaw can actually stimulate flushing.

In mild oceanic climates (Atlantic coast of France, Ireland, Britain) fruiting may extend into January or even February. By contrast, in continental climates with early severe winters the season may close abruptly in November.

In the Pacific Northwest of North America the season shifts slightly earlier, September-December.

Grows singly, in small groups of 2-6, or in scattered troops and fairy rings.

Cap buttons emerge from the soil or litter with margins tightly incurved. The whole fruiting body is initially compact and squat before the cap expands and flattens.

Mycelium is sometimes visible as violet threads in disturbed litter around fruiting bodies - a useful confirmatory clue.

The species may produce multiple flushes over several weeks if moisture persists. In compost heaps it can be extraordinarily prolific, producing dense masses of fruitbodies over many seasons once established.

Clitocybe nuda is exceptionally cold-tolerant, fruiting well into temperatures near freezing. Flushes are strongly triggered by autumn rainfall after summer drought, with mycelium requiring cool, moist conditions (soil temperature 4-10°C optimal). Unlike many autumn species, blewits continue fruiting through light frosts (-2°C overnight) provided the soil does not freeze deeply. A warm, wet October followed by a cold November often produces the most productive flushes.

The most serious confusion is with Clitocybe nebularis (clouded funnel), which grows in similar habitats at the same season. Clouded funnel differs by:

• a pale grey-buff to whitish-grey cap with no violet tints
• crowded white to cream gills that run slightly down the stem (decurrent)
• a white stem with no blue colouration
• a rank, unpleasant mealy or rancid smell - never the sweet floral perfume of blewit

Clitocybe nebularis causes gastrointestinal poisoning in many people even after cooking and should be avoided.

Cortinarius species (webcaps), particularly in the violet-coloured group (e.g. Cortinarius violaceus, C. camphoratus, C. traganus), can share the lilac-purple colouration. But they possess a cobweb-like cortina (partial veil) connecting the cap margin to the stem when young, which leaves a rusty-brown fibrillose zone on the upper stem; their gills become rusty-brown from the spores; the spore print is rust-brown, not pink.

Some Cortinarius species, especially those in section Phlegmacium and the deadly Cortinarius orellanus / C. rubellus group, cause fatal kidney failure (orellanine toxin). Always check for rust-brown spore print. Cortinarius camphoratus and C. traganus share an aromatic but musty or goat-like smell rather than the fresh citrus-floral note of blewit.

Laccaria amethystina (amethyst deceiver) is a much smaller woodland species (cap 1-5 cm), brilliant violet-purple throughout, with widely spaced thick gills, a slender fibrous stem, and a white spore print - it is edible but so small it rarely causes confusion with the much larger blewit.

Entoloma species (pinkgills), particularly the deadly Entoloma sinuatum (livid pinkgill) and related taxa, have pink gills at maturity and a pink spore print, but the gills are typically not initially violet, caps are not hygrophanous violet, and many species have a mealy smell and are poisonous.

Faded or dried blewit caps that have lost their violet colour must not be confused with small white toxic funnels such as Clitocybe rivulosa (fool's funnel) or Clitocybe dealbata (ivory funnel), both of which contain muscarine and can be deadly - always verify violet tones remain somewhere on the specimen, especially on the stem.

Choose firm, young specimens with caps still convex to flat and gills retaining good violet colour - older caps become soft, waterlogged, and develop a mealy or unpleasant smell.

Brush off leaf litter and cut the stem cleanly at ground level; the distinctive smell should be immediately apparent. Transport in a basket with good airflow to prevent sweating.

Reject any specimens that smell mealy, fishy, or unpleasant, as these may be mistaken for other Clitocybe species. Examine every single specimen collected for correct gills, stem colour, and smell before cooking, as lookalikes in the same environment are dangerous.

Blewits must always be cooked thoroughly - they are mildly toxic raw and can cause gastrointestinal upset in sensitive individuals even when slightly undercooked.

Wood blewit is a versatile kitchen mushroom prized for its delicate floral aroma and firm, meaty texture.

Sautéing in butter over medium-high heat until golden brings out a nutty, slightly earthy flavour while driving off excess moisture - the violet colour mostly disappears on cooking, leaving an attractive pale tan.

Blewits pair well with cream sauces, shallots, garlic, and thyme. They are excellent in risotto, pasta, omelettes, and as a filling for pastry. The firm texture holds well in soups and stews without disintegrating.

Because their moisture content is relatively high, avoid crowding the pan; cook in batches. They dry adequately and can be reconstituted, though drying diminishes the floral aroma.

The distinctive perfume is strongest in fresh, young specimens. Blewits combine well with other robust autumn flavours - game, walnuts, squash, aged cheese.

Clitocybe nuda must be cooked before eating - it contains mild toxic compounds destroyed by heat. Raw or undercooked blewits have caused gastrointestinal distress (nausea, vomiting, diarrhoea) and rare hypersensitivity reactions in some individuals. Always cook thoroughly.

The paramount safety concern is distinguishing blewit from several dangerous species:

• Clitocybe nebularis (generally toxic, same habitat and season)
• violet Cortinarius species (some lethally nephrotoxic with orellanine)
• Entoloma sinuatum (livid pinkgill, seriously poisonous)

Faded specimens must also be distinguished from deadly white muscarine-containing funnels (Clitocybe dealbata, C. rivulosa).

The triple-check for blewit identification is:

1. 1violet to lilac cap and stem with hygrophanous fading
2. 2sweet, floral, citrus-orange perfume
3. 3pale pink-buff spore print with no rust-brown colouring

Never collect on smell alone - always perform a spore print if uncertain.