Shingled Hedgehog (Sarcodon imbricatus) — identification, habitat & look-alikes

The shingled hedgehog is a big brown mushroom whose cap is covered in coarse, dark, raised scales like roof shingles, with short spines instead of gills underneath. It grows across North America and is especially common in the Rocky Mountains, where it fruits under Engelmann spruce and subalpine fir. It's also known as the scaly hedgehog.

Appearance

Appearance: Cap about 2–10 in (5–25 cm) wide, occasionally close to 12 in (30 cm), brown with coarse dark brown to blackish scales and a central dip that may open into a hole with age. Brittle spines about ¼–⅝ in (0.5–1.5 cm) long run down the short, stout stem. Flesh is whitish to pale brown, and the is brown.

Look-alikes

Scaly toothSarcodon squamosus

Hard to separate by looks alone; the scaly tooth grows with pines, while the shingled hedgehog grows with spruce and fir. A microscope check of the flesh (for clamp connections) is needed to be sure.

Why they get mixed upThey were treated as one species until DNA studies split them.

Hydnellum scabrosum

Look at the stem base: this species has a turquoise or greenish tint there and tastes bitter. The shingled hedgehog has no green stains at the base.

Why they get mixed upBoth are brown tooth fungi with spines under the cap.

Old man of the woodsStrobilomyces strobilaceus

Check underneath: old man of the woods has pores, not spines.

Why they get mixed upBoth have a shaggy, dark-scaled cap.

Where it lives

Typical habitats: Spruce and fir forests
Mountain conifer forests
Range: Reported across North America and Europe, and especially common in the Rocky Mountains.
Preferred conditions: Grows on the ground in partnership with spruce and fir roots, often in hilly or mountainous country.
Seasons: In the US
Fruit Jul–Sep

Life cycle

Reproduction: Brown spores are released from the spines on the underside of the cap.

Cautions

Cautions: Reports on eating it disagree: some call it a decent edible, others note bitterness in older specimens and possible stomach upset.

Name and classification

About the name: Older records also included a pine-loving lookalike, but DNA work showed the spruce and pine forms are different species; the pine one is now Sarcodon squamosus. A 2024 study of mushrooms sold in China split more species out of the group, and many North American collections called S. imbricatus haven't been checked by DNA yet.