Wood Blewit Collybia nuda

Identification

• Cap: 4–14 cm across, occasionally to 18 cm; domed with an inrolled edge when young, flattening out with age; violet to lilac-brown, fading to tan or beige with age and after rain; smooth, slightly sticky when wet (Arora, Bigelow)
• Gills: Crowded, sinuate to slightly decurrent; violet when young, fading to buff-brown with age
• Stipe: 3–10 cm tall, 1–3 cm thick; stout and fibrous; lilac to pale violet, often with a slightly swollen base
• Spore Print: Pale pinkish-buff
• Odor: Mildly fragrant — often described as slightly floral or perfumed
• Season: Late fall into early spring; iNaturalist records peak in November

The violet coloring is the key feature, but be aware that it fades significantly in older specimens and after rain. Fresh, young blewits can be strikingly purple throughout; as they age the cap fades fastest, while the gills and stem base tend to hold their color longest. Always check for the combination of violet gills, pale pinkish spore print, and the characteristic fragrant odor.

Habitat & Where to Find Them

Unlike most gourmet mushrooms in the Pacific Northwest, wood blewits are saprotrophic — they feed on decomposing organic matter rather than forming mycorrhizal partnerships with trees. They grow almost anywhere plant debris builds up, sometimes in large fairy rings, and are common in urban areas and at lower elevations but largely absent from undisturbed high-elevation forest (Siegel & Schwarz):

• Garden borders and compost: Blewits are a regular in well-composted garden beds, wood chip mulch, and the edges of compost piles
• Parks and urban green spaces: One of the few gourmet species that fruits reliably in landscaped areas
• Deciduous leaf litter: Under oaks, cottonwoods, alders, and maples — anywhere leaves accumulate in thick layers
• Mixed woodland edges: Forest margins where deciduous and coniferous trees meet, with deep duff layers

In western Washington and Oregon, look for blewits after sustained fall rains, once nights have turned cold. They often appear in the same spots year after year, so a productive patch is worth revisiting. Use the Forayz map to check current soil temperature and precipitation data for your area.

Lookalikes & Safety

The wood blewit’s purple coloring narrows the field of potential lookalikes considerably, but there are a few species to be aware of. For a broader overview of toxic mushrooms in the Pacific Northwest, see our dedicated page.

• Cortinarius species (webcaps): This is the most important group to distinguish. Several purple Cortinarius species share similar coloring, and some are dangerously toxic. The key difference: Cortinarius have rusty-brown spore prints (blewits have pinkish-buff), and young specimens show a cobweb-like cortina (partial veil) between the cap edge and stem. If you see any trace of a cortina or rusty-brown spores — it is not a blewit.
• Collybia sordida (sordid blewit): Smaller, with a slimmer, fibrous stem. Usually not purple, though often lilac-tinged when wet, especially the gills (MycoMatch). Edible, but not easy to identify (Arora).
• Clitocybe violaceifolia and Lepista glaucocana: Two paler lookalikes. C. violaceifolia tends to fade to a dingy, metallic silvery-gray rather than the blewit’s brown, and favors duff under cypress, cedar, and juniper (Siegel & Schwarz); L. glaucocana never shows the blewit’s deep violet tones, though badly faded specimens of either can be hard to separate from a faded blewit.

The critical rule: If you’re collecting purple mushrooms and you see a rusty-brown spore print or any sign of a cobweb veil, stop. You likely have a Cortinarius, and some species in that genus cause delayed kidney failure. Always take a spore print when collecting blewits for the first time.

Cooking & Edibility

Wood blewits are a good edible mushroom with a mild, slightly sweet flavor and a firm, meaty texture that holds up well in cooking. A few important notes:

• Always cook thoroughly. Blewits are mildly poisonous raw and can cause gastrointestinal upset (Lincoff).
• Sauteing: The most common preparation. Cook in butter over medium heat until the moisture releases and the edges begin to brown. Pairs well with garlic, thyme, and cream sauces.
• Soups and stews: Their firm texture makes them excellent in heartier dishes. They hold their shape well and don’t become slimy.
• Drying: Blewits dry well and can be rehydrated for year-round use, though their flavor is better fresh.

Sources: Mushrooms of Cascadia (Siegel & Schwarz, 2024); MycoMatch (© Ian Gibson), a compilation of published descriptions through which most other field-guide authors named here are quoted; iNaturalist observations.