How to identify White Milkcap

To correctly identify White Milkcap (Lactarius piperatus), check each of these features in order. Misidentification is the most common cause of mushroom poisoning, so cross-reference multiple sources.

Step-by-step identification

1. 1

   Cap

   Shape, color, surface texture, and diameter.

   The cap is 5-15 cm (2-6 inches) in diameter, initially convex with an inrolled margin, becoming broadly funnel-shaped or depressed in the center with age. The surface is dry, smooth, and unzoned, pure white to creamy white, often developing yellowish or brownish stains with handling or age. The margin remains inrolled for a long time.

2. 2

   Gills

   Attachment to stem, color, and spacing.

   The gills are very crowded (crowded to subdistant), narrow, decurrent, and white to creamy white, sometimes developing yellowish tints with age. They are often forked near the stem.

3. 3

   Stem

   Length, shape, surface, and any ring.

   The stem is 3-8 cm (1.2-3.2 inches) long and 1-3 cm (0.4-1.2 inches) thick, stout, cylindrical or tapering towards the base, solid, and white. The surface is smooth or finely pruinose.

4. 4

   Flesh

   Color, texture, and bruising reaction.

   The flesh is thick, firm, brittle, and white. It exudes a copious white, unchanging, acrid latex when cut or broken.

5. 5

   Fruiting body

   Overall growth pattern.

   The fruiting body is typically robust and entirely white, often becoming stained with soil or debris. It exudes a white, acrid latex when cut.

6. 6

   Habitat

   Where it grows and on what substrate.

   Lactarius piperatus is mycorrhizal, forming symbiotic relationships with various deciduous and coniferous trees, particularly oak (Quercus), beech (Fagus), and sometimes pine (Pinus). It grows solitarily or scattered on the ground in broadleaf and mixed woodlands.

Key Facts

Cap surfaces

Dry, smooth, unzoned, pure white to creamy white.

Growth Form

Solitary to scattered.

Spore Print

White to creamy white.

Body color

Entirely white to creamy white.

Odor

Faint, indistinct.

Flesh bruises

Does not bruise, but may stain yellowish or brownish with age or handling.

Height

3-8 cm (1.2-3.2 inches)

Cap Diameter

5-15 cm (2-6 inches)

Fruit body characteristics

• Gill attachment: Decurrent
• Stem shape: Cylindrical or tapering towards the base
• Stem surface: Smooth or finely pruinose
• Ring: Absent
• Stem cross-section: Solid

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