Overview
The Hazel Gloves Fungus (Hypocreopsis rhododendri) is one of the most extraordinary, bizarre, and rarest macrofungi in Europe. Confined strictly to ancient, moss-draped Atlantic hazel rainforests along the hyper-oceanic western fringes of Scotland and Ireland, this specialized ascomycete forms unmistakable radiating, fleshy orange lobed cushions that clasp around tree stems like miniature leather gloves or rubbery starfish. Biologically, it is not a wood-rotting fungus at all, but rather a hyperparasite that preys exclusively on another fungus living on the hazel bark.
Biology and Physical Characteristics
Hypocreopsis rhododendri forms a conspicuous, multi-lobed stroma that wraps tightly around slender hazel branches. The radiating, finger-like lobes are smooth to irregularly wrinkled, colored in striking shades of warm ochre-yellow, apricot, and rich reddish-brown, with pale, creamy buff margins. Embedded across the upper surface of these fingers are thousands of microscopic perithecial flasks where reproductive ascospores mature. The fungus requires an astonishing double-host ecology: it cannot digest wood directly, but instead parasitize the mycelium of the Glue Crust fungus (Hymenochaete corrugata).
Behavior and Ecology
Strictly dependent on the hyper-humid microclimates of Europe’s temperate Atlantic rainforests, the hazel gloves fungus thrives where high annual rainfall, frequent mists, and clean oceanic air prevent desiccation. The Glue Crust fungus first colonizes dead hazel stems, physically gluing neighboring branches together to prevent them from falling to the wet forest floor. Hypocreopsis rhododendri then attacks the living crust, absorbing nutrients from the host fungal tissue. Its perennial fruitbodies expand slowly over several years, releasing windborne ascospores during damp autumn and winter spells.
Conservation and Human Impact
Classified as Endangered on the European Red List of Fungi, Hypocreopsis rhododendri has vanished from much of its historical range due to the destruction and fragmentation of ancient temperate hazel woods, commercial conifer planting, and overgrazing by sheep and red deer. Because it serves as a keystone bioindicator for unbroken ancient Atlantic woodland continuity, dedicated conservation initiatives in Scotland (such as the Alliance for Scotland’s Rainforest) prioritize safeguarding ancient hazel stands and monitoring surviving colonies.
Interesting Factoid
This bizarre fungus looks like a tiny orange rubber glove wrapping its fingers around a tree branch, and it doesn’t eat wood—it’s a fungal vampire that eats another mushroom for dinner!
Last updated: October 2026