The damp floor of a mature woodland contains many hidden marvels, but few are as captivating as this small, delicate mushroom. The bleeding mycena is globally celebrated for its unique colouration and a remarkable physiological trait that gives the species its memorable common name. Emerging from decaying wood, the cap is initially bell-shaped, expanding into a broader umbrella form while retaining a central bump. Its colour ranges from a soft pinkish-brown to a deep burgundy, fading near the finely scalloped edges. The most astonishing characteristic of this fungus is its ability to exude a dark, reddish-purple latex fluid when any part of the fruiting body is broken. This sap closely resembles drops of blood, pooling along the fractured flesh of the stem. Beneath the cap, the narrow gills are crowded together, initially pale white before maturing into a soft pinkish-grey. The slender, hollow stem is covered in a delicate, powdery coating when young, sharing the same wine-red pigmentation as the cap. Beyond its striking visual appearance, this organism serves an essential ecological purpose as a wood-decaying saprotroph within forest ecosystems. It colonises dead hardwood logs and rotting tree stumps, establishing an invisible network of microscopic threads known as mycelium within the timber. By secreting specialised enzymes, the fungus breaks down complex organic polymers like cellulose and lignin, converting dense wood into accessible nutrients that enrich the surrounding soil. This decomposition process is vital for forest health, fostering new plant growth and driving the carbon cycle. Interestingly, this species is also known to exhibit weak bioluminescence, with its mycelial threads emitting a faint green glow visible in complete darkness. When environmental conditions are optimal during wet autumn periods, the mushroom releases thousands of microscopic, white spores from its gill surfaces. These spores are carried away on gentle air currents, seeking out new pieces of damp wood to begin the lifecycle over again. Encounters with this distinctive fungus provide an exciting highlight for amateur mycologists and nature walk enthusiasts throughout New Zealand. Because it grows in tight, crowded clusters, a single log can host dozens of tiny caps, creating a spectacular visual display against the mossy background. Its reliance on dead timber means it is highly sensitive to forest management practices that remove fallen logs and coarse woody debris. Leaving dead wood to rot naturally in regional parks ensures that these specialised decomposers can continue to thrive. Documenting sightings through modern citizen science platforms helps map regional distribution, offering insights into the health of local saprotrophic communities. Spotting the deep burgundy caps of this intriguing little mushroom offers a wonderful glimpse into the complex world of fungal ecology.