Fungi are the misfit organisms of the natural world, and some of them are truly the creepiest looking members of the kingdom. Although they are genetically closer to animals than plants, they were once lumped together with plants for centuries. Their odd cell structures and bizarre lifestyles make them a realm of their own.
10 Dead Man’s Fingers
Most fungi spend the bulk of the year hidden beneath the soil, only surfacing when they send up their spore‑producing structures. Xylaria polymorpha, better known as Dead Man’s Fingers, shoots up gnarled, black “fingers” that look like a corpse’s desperate attempt to claw its way out of the earth. The black surface you see is the spore‑bearing part of the fungus, which feeds on decaying plant material hidden below.
What Makes These Fungi So Creepiest Looking
Their unsettling appearance often stems from unusual reproductive strategies, vivid pigments, or bizarre growth forms that evolved to lure insects or spread spores in the most eye‑catching ways.
9 Devil’s Tooth
Hydnellum peckii wears many nicknames—bleeding‑tooth fungus, strawberries and cream, red‑juice tooth, and Devil’s Tooth—all of which point to its shocking appearance. A vivid red fluid gushes from the cap, giving the impression of a wound that never stops bleeding.
This fungus forms a symbiotic partnership with pine trees, wrapping its fine strands around the roots to trade nutrients. The trees hand over sugars, while the fungus supplies mineral nutrients in return. Scientists aren’t sure why the fungus exudes that blood‑like ooze, but analysis shows it contains atromentin, a compound with anticoagulant properties.
8 Common Stinkhorn
Phallus impudicus translates from Latin as “shameless penis.” The fungus erupts from an underground “egg” and can sprint to a 25‑centimeter height in a matter of hours—truly shameless growth.
The tip of the stalk is coated with a sticky, foul‑smelling slime that attracts flies. Those unsuspecting insects crawl over the gleba, picking up spores that they later carry to new locations. Even Etty Darwin, Charles Darwin’s granddaughter, was so horrified by the shape that she rose before dawn to hack the creatures down.
7 Ink Cap
The common ink cap starts life as a modest, flat, creamy‑brown mushroom. As it ages, the cap darkens and the flesh begins to liquefy, literally dripping black “ink” onto the forest floor—a process called deliquescence.
Scientifically known as Coprinopsis atramentaria, it’s also called tippler’s bane. The mushroom is mild‑flavored and technically edible, but it harbors a nasty secret: it produces coprine, a chemical that reacts dangerously with alcohol. Even days after eating, a sip of booze can trigger severe reactions.
6 Octopus Stinkhorn
Clathrus archeri carries two common names—Octopus Stinkhorn and Devil’s Fingers. It bursts from an egg‑like sack, sprouting four to eight “fingers” that curl outward like a sea creature’s tentacles.
Like its stinkhorn cousins, it oozes a foul‑smelling slime to lure flies, which then transport its spores. While some stinkhorn eggs are considered delicacies in certain cultures, the Devil’s Fingers themselves are not prized for any cuisine.
5 Apple Rust
Cedar‑Apple Rust boasts a tangled life cycle that hops between apple trees and junipers. In spring, spores land on apple leaves, forming unsightly spots on the undersides. Those spores then drift to juniper branches, where they coax the plant into growing round, tumor‑like galls called “cedar apples.”
When rain finally washes over these galls, yellow spikes erupt, releasing fresh spores that can once again infect apple foliage, perpetuating the cycle.
4 Cordyceps
Cordyceps fungi are culinary treasures in some Asian soups, but their origin is far more macabre. A single spore can infect an insect, sprouting inside the host and consuming its organs.
When the fungus has exhausted its buffet, it forces its way out, shooting long, spore‑laden spikes through any opening. Some species even manipulate ants, secreting chemicals that compel the insect to climb high into trees before the fungus erupts, ensuring maximal spore dispersal.
3 Luminous Mushrooms
Bioluminescent fungi glow eerily in the dark, though scientists aren’t entirely sure why. The prevailing theory is that the greenish light lures insects, much like a porch light attracts moths, helping the fungus spread its spores.
These glowing organisms have been called fox fire or faerie fire for centuries. Their luminescence comes from the enzyme luciferase, and modern researchers even speculate about engineering trees that could light up pathways.
2 Brain Fungus
Gyromitra esculenta, a false morel, bears a brain‑like, convoluted appearance that’s as unsettling as it’s poisonous when raw. While some Scandinavian cultures enjoy it after careful cooking, the toxin can accumulate and has been linked to fatal outcomes.
True morels are prized for their honeycomb caps, but the deceptive look of this “brain fungus” serves as a warning: never assume a mushroom is safe based on appearance alone.
1 Anemone Stinkhorn
The Anemone Stinkhorn, or Aseroe rubra, was the first Australian fungus ever described. Its name reflects the revolting “disgusting juice” (gleba) that coats its surface, a sticky, olive‑brown slime that attracts flies.
After breaking free from its subterranean egg, the fungus unfurls six to ten bifurcated arms that resemble a sea anemone, completing its eerie, otherworldly look.