### Identification Commonly known as the Mica Cap, *Coprinellus micaceus* is a small but striking mushroom. Look for acorn-shaped caps (1–5 cm) that expand into ribbed bells with age. They are a warm honey-tan or tawny-brown, fading to grey at the edges. The defining field mark—and the source of its name—is the coating of tiny, salt-like granules that glisten like mica on young specimens. These "jewels" are easily washed away by rain, so look closely at fresh clusters. Unlike the larger, smoother Common Inky Cap (*C. atramentarius*), the Mica Cap is daintier and always sports these sparkling remnants of its universal veil.
### Habitat & Range This is a cosmopolitan species, appearing across North America and Europe from spring through autumn. You’ll find them in deciduous forests, but they are equally prolific in urban settings. They grow in dense, overlapping clusters at the base of hardwood stumps or appearing to rise from the grass; in the latter case, they are actually feeding on buried roots or wood debris beneath the surface.
### Behaviour Mica Caps are "gregarious" and ephemeral. They respond rapidly to moisture, often exploding into view after a heavy rain. Their most dramatic behaviour is deliquescence: as the spores mature, the gills autodigest, turning the cap into a black, gooey ink. This isn't rot; it’s a clever dispersal strategy that allows the spores to be carried away in liquid or exposed to the wind as the cap curls upward.
### Diet As a saprobic fungus, the Mica Cap plays a vital role as a recycler. It survives by breaking down dead organic matter—specifically the lignin and cellulose in hardwood—transforming dead wood into nutrient-rich soil.
### Fascinating Fact The "ink" produced during the mushroom's self-digestion was historically used as a legitimate writing medium. If collected and boiled with a touch of cloves for preservation, the fungal fluid creates a permanent, dark pigment that naturalists of the past used to sketch the very mushrooms they were studying!