A distinctive lilac Myxacium immediately recognised by its persistent sharply conic papilla and its very strong raw-cucumber odour (sometimes fishy in old specimens). Among all lilac Myxacium in New Zealand, this species is the only one with such a pronounced odour, making it unmistakable in the field.

Cap: Up to 50 mm diam.; at first sharply conic with a strongly incurved margin, later convex to expanded, but always retaining a persistent conic or umbonate‑conic papilla. Colour fuscous, date‑brown, or hazel‑brown, becoming paler or ochre‑brown with age; sometimes lilac‑tinged near the margin from the gluten. Surface glutinous, hygrophanous, but margin not striate. Dry specimens often wrinkled.
Lamellae: (10–24, up to 15 tiers of lamellulae). Crowded, adnexed to adnate to broadly adnate‑emarginate. Up to 8 mm wide. Colour lilac at first, soon argillaceous, then pale rust‑brown. Edges crenulate to fimbriate, lilac when young, concolorous in old basidiomes.
Stipe: Up to 90 × 8 mm; cylindrical, sometimes gradually attenuated toward apex. Colour lilac at first, soon fading to white, with pale ochre‑brown base. Apex dry; below this, a thick glutinous coat extends from a submembranous, striate, ring‑like zone to the base. Cortina rudimentary or absent. Solid → fistulose. Usually single, sometimes cespitose.
Context: Dark brown in pileus. Lilac in upper stipe. Whitish to pale ochre in stipe base.
Odour/taste: Very strong raw‑cucumber odour, sometimes fishy in old specimens. Taste similar to odour.