Stumbled across these black, finger-like things poking out of the mulch in my backyard. They are hard and creepy. Does anyone know what this is?

Dead Man’s Fingers thrive in environments rich in decomposing wood, which is why they often appear in mulch or garden beds with a high content of wood chips. The presence of decaying organic matter provides the nutrients necessary for the fungus to grow.
Moisture and shade are also key factors that contribute to the growth of this fungus. Areas that are frequently damp or receive limited sunlight create optimal conditions for fungal development. Seasonal changes, particularly in spring and fall, can also trigger their appearance as the climate becomes more favorable for fungal activity.
5. Is Dead Man’s Fingers Dangerous to People, Pets, or Plants?
The good news is that Dead Man’s Fingers is not harmful to humans, pets, or plants. While the appearance might be unsettling, this fungus does not pose a threat through touch or proximity. It is not considered edible, however, due to its tough texture and unappealing taste.
For plants, the presence of Dead Man’s Fingers is not detrimental as it primarily targets dead matter for decomposition. It does not parasitize living plants, making it a benign presence in your garden from a horticultural perspective.