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How to Identify Dead Man's Fingers, Black Fingers

Xylaria polymorpha
INEDIBLE Season // Aug-Nov Family // Xylariaceae

Description

Xylaria polymorpha is a distinctive fungus that resembles a cluster of black, finger-like projections emerging from the ground or decaying wood. The fruiting bodies are typically 5-15 cm tall, with a white to grayish base and dark, almost black tips.

Key Identification Features

Field marks recorded for this species. Work through all of them, not just one:

  • Finger-like structures
  • Black to dark brown coloration
  • White to grayish base
  • Fruiting bodies clustered together
  • Surface is often wrinkled or ridged

Specimen Profile

FamilyXylariaceae
GenusXylaria
EdibilityInedible
Toxicitynone
SeasonAug-Nov
HabitatGrows on decaying wood, particularly in forested areas, often found at the base of trees or on buried wood.
RegionWidely distributed in temperate regions, including North America, Europe, and parts of Asia.

Habitat & Distribution

Habitat: Grows on decaying wood, particularly in forested areas, often found at the base of trees or on buried wood.

Region: Widely distributed in temperate regions, including North America, Europe, and parts of Asia.

Seasonality

Fruits primarily in late summer to fall.

Typical months: Aug-Nov

Common Lookalikes

Always verify identification to avoid these similar species. The differentiator is the point — learn the one or two tells that separate them:

Xylaria hypoxylon (inedible)

HOW TO TELL APART

has a more cylindrical shape and is typically lighter in color.

Xylaria longipes (inedible)

HOW TO TELL APART

features longer, more slender fruiting bodies and a different habitat preference.

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Disclaimer: This guide is for educational purposes only. Never consume a wild mushroom unless you are 100% certain of its identification.