Closer to Animals Than to Plants
Fungi are more closely related to animals than to plants. A honey fungus in Oregon spans 2,300 acres — the largest known organism by area. Lichens, long classified as single organisms, are actually partnerships between fungi and algae.
The kingdom splits into major divisions. Basidiomycota includes the mushrooms you'd recognize — chanterelles, porcini, fly agaric. Ascomycota, the largest division, holds morels, truffles, baker's yeast, and penicillium molds. A truffle is essentially a mushroom that evolved to fruit underground, recruiting animals instead of wind to spread its spores.
Appearances deceive constantly. The death cap and paddy straw mushroom look similar enough that misidentification kills people every year, yet they sit on completely different branches. 169 fungi from the yeast in your bread to the mycorrhizal networks connecting forest trees.
Did you know?
- *Fungi are more closely related to animals than to plants — both kingdoms share a common ancestor that plants diverged from over a billion years ago.
- *A single honey fungus specimen in Oregon spans roughly 2,385 acres and is estimated to be between 2,400 and 8,650 years old, making it one of the largest and oldest organisms on Earth.
- *Truffles are essentially mushrooms that evolved to fruit underground, relying on animals that dig them up to spread their spores instead of wind.
- *Penicillium, the mold genus that gave us the antibiotic penicillin, is a close relative of the fungi used to make blue cheese and salami.
What is GuessKin?
GuessKin is a free daily guessing game built on real-world taxonomy. Choose from over 20 categories and try to identify the mystery fungus. Each guess reveals how closely related your answer is to the target through a shared classification tree.
How does it work?
Every fungus in GuessKin sits on a taxonomy tree — a branching hierarchy that shows how things are classified and related. When you make a guess, the game shows you the nearest common ancestor between your guess and the answer. The closer that ancestor is to the answer, the warmer you are. The tree visualization grows with each guess, narrowing down where the answer lives and helping you triangulate.
How to get the best score
- •Fewer guesses is better. The ideal game is guessing it in 1. Every guess counts against your score.
- •Speed matters too. The timer starts on your first guess. Quick, confident answers are rewarded.
- •Read the tree. Each guess gives you real taxonomic information. Pay attention to which branch the answer is on and which branches you've already ruled out.
- •Start broad, then narrow. Your first guess splits the tree. Pick something that gives you maximum information, then drill into the revealed branch.
Each GuessKin category uses a real classification system. These aren't made-up groupings — they're the same systems scientists and specialists actually use. New categories are added regularly. Every category is free, with no accounts and no ads.