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Lactarius aurantiacus

Orange milkcap

Lactarius aurantiacus — 2026-10-04
Scientific identification
Lactarius aurantiacus (Pers.) Gray
Family
Russulaceae
Class
Agaricomycetes
Genus
Lactarius

Names across languages

  • English: Orange milkcap
  • German: Milder Milchling
  • Finnish: Oranssirousku
  • Estonian: Oranž riisikas
  • Russian: Млечник неедкий

The scientific profile

From the latest record: 2026-10-04.

Hymenium

Gills moderately spaced; whitish to cream when young, becoming pinkish-buff to pale ochre

Cap

Convex when young, later broadly flat to shallowly depressed; smooth, dry to slightly glossy; vivid orange, orange-red to orange-brown; unzoned, margin initially inrolled

Hymenium Attachment

Broadly adnate to shortly decurrent

Stipe

Cylindrical to slightly clavate, smooth, orange-brown to yellow-orange, usually paler near apex; becoming hollow with age; ring absent

Spore print

Spore print ivory to pale cream

Ecology

Mycorrhizal mainly with spruce and pine, occasionally birch and other hardwoods; coniferous and mixed forests, often on acidic soils; solitary, scattered or gregariously; summer to late autumn

Edibility

Edibility disputed; generally not recommended

Fruit body

Fruit body small to medium; stipe ~2.5–7 cm long and ~0.5–1.2 cm thick

Dimensions

Cap ∅ ~1–5(–7) cm

Flesh

Whitish to pale orange, brittle; abundant white latex unchanging, mild

Chemical reactions

Guaiac grey-green; FeSO₄ grey-green on flesh

Odour

Faint, slightly unpleasant, rubbery

Taste

Mild, slightly bitter, radish-like

Microscopy

Spores broadly ellipsoid to subglobose, ~7–9.5 × 6–7.5 µm, ornamented with low amyloid warts and connecting ridges; numerous fusoid cystidia

Overview

Small vivid orange milkcap with immutable white latex

1821). Nat. Arr. Brit. Pl. (London) 1: 624.

Field encounters

04/Oct/2026, 1:30 PM

Kalmuse tee, Tallinn, Harju, Eesti

City zone nearby pine dominant forest, withing Pinus sylvestris trees, on grassland with conifer litter

59°28'07.9"N 24°50'32.3"E

🌡️ 12°C 🌦️ Drizzle, mostly cloudy 💨 Wind 230° SW->NE, 20 km/h

Original Instagram post

Source hashtags

#lactariusaurantiacus #mushroomphotos #fungimacro #orangemilkcap #naturephotography

Back to the collection · Photography and field notes by @fungarium.info