Overview
The Amber Jelly Fungus (Exidia recisa), commonly known as the willow jelly or amber jelly roll, is an eye-catching, gelatinous wood-decaying macrofungus widely distributed throughout the temperate riparian woodlands of North America, Europe, and Asia. Characterized by its shiny, translucent amber to caramel-brown fruiting bodies that erupt along dead, attached hardwood twigs in late autumn and winter, this resilient saprotroph possesses an extraordinary biological tolerance for freezing and drying, repeatedly shriveling into black crusts only to revive within minutes upon contact with rain.
Biology and Physical Characteristics
Exidia recisa produces clustered, disc-to-cup-shaped gelatinous basidiocarps that measure one to two inches across. In moist weather, their texture is soft, rubbery, and pliant, displaying glowing translucent shades of amber, bronze, and reddish-brown with a smooth, glossy fertile upper surface (hymenium) that often develops fine surface wrinkles and scattered microscopic papillae. When dry weather sets in, the fungus rapidly dehydrates into a tough, inconspicuous, blackened crust adhering flatly to tree bark, capable of surviving subzero winter freezes without cellular damage.
Behavior and Ecology
Functioning ecologically as a specialized primary saprotrophic colonizer, Exidia recisa targets dead, unfallen twigs and small branches of deciduous trees—with a marked evolutionary affinity for willows (Salix), alders (Alnus), and poplars (Populus). It induces a white rot, secreting specialized ligninolytic enzymes that break down tough structural lignin and hemicellulose in dead wood tissues, releasing locked nutrients back into riparian forest soils. Its microscopic, curved, sausage-shaped basidiospores are discharged into humid winds, colonizing freshly dead twigs high above the ground litter.
Conservation and Human Impact
Evaluated as Least Concern and globally secure across mycological registries, Exidia recisa is common and abundant wherever healthy native riparian willows and damp wetland forests thrive. It faces few direct conservation threats, though widespread drainage of wetland floodplains and removal of dead riverbank scrub can limit local substrate availability. To foragers and nature enthusiasts, its glowing amber cushions provide a welcome burst of vibrant life in bleak, snow-dusted winter woods, serving as an important bioindicator of healthy, unpolluted riverine microclimates.
Interesting Factoid
This incredible jelly fungus can freeze solid in subzero blizzards, dry out into an invisible black crust, and then magically puff back into a glowing, translucent amber jelly cushion within 15 minutes of a winter rainstorm!
Last updated: October 2026