### Identification Commonly known as the Fluted Bird's Nest, *Cyathus striatus* is a master of miniature mimicry. Look for tiny, trumpet-shaped cups (peridia), usually 7–15mm tall. The exterior is distinctive: a shaggy, chocolate-brown "wool" that feels like coarse felt. The real giveaway, however, is inside. Once the lid (epiphragm) bursts, it reveals a shiny, lead-grey interior marked with deep, vertical grooves—the "striations" for which it is named. Nestled at the bottom are 10–12 silver-grey "eggs" (peridioles). To distinguish it from the similar *Crucibulum laeve*, check the interior; *Crucibulum* is smooth and yellow-orange, lacking the elegant fluting of *C. striatus*.
### Habitat & Range This species is a cosmopolitan traveler, found throughout temperate regions of North America, Europe, and Asia. It thrives in damp, shaded environments, favoring deciduous forests but often colonizing suburban landscapes. You will find them huddled in gregarious clusters on decaying wood, fallen branches, and—most frequently for the backyard naturalist—on wood-chip mulch and sawdust.
### Behaviour & Diet As a saprobic fungus, *C. striatus* is a vital forest recycler. It doesn't "hunt," but rather "eats" by secreting enzymes that break down complex lignin and cellulose in dead wood. Its most active "behaviour" is its reproductive strategy: the splash-cup mechanism. During rainstorms, the cup acts as a parabolic dish. When a single raindrop hits the interior at the correct angle, the kinetic energy hurls the "eggs" up to 3–4 feet away from the parent cup.
### Fascinating Fact The "eggs" don't just fly blindly; they are equipped with a "hitchhiking" device called a funiculus. This is a microscopic, coiled cord that unfurls instantly upon ejection. As the egg flies through the air, the sticky cord catches on a nearby twig or blade of grass and wraps around it like a tiny bola, tethering the spores in an elevated position where they can better disperse!