Overview
The Toothed Jelly Fungus (Pseudohydnum gelatinosum), commonly known as the jelly tooth, false hedgehog fungus, or cat’s tongue, is an extraordinary basidiomycete that combines the gelatinous, rubbery texture of jelly fungi with the downward-pointing spines characteristic of tooth fungi. Widely scattered across temperate conifer forests around the globe, this translucent, ghost-like woodland marvel colonizes moss-covered decaying logs during wet autumn months, creating an ethereal spectacle on shadowy forest floors.
Biology and Physical Characteristics
Pseudohydnum gelatinosum produces a fan-shaped, spatulate, or tongue-shaped pileus attached by a short lateral stipe. The entire fruiting body possesses a soft, pliable, gelatinous consistency ranging from frosty opalescent white to watery grey-brown. On the lower hymenial surface, instead of gills or pores, it bears hundreds of soft, translucent conical spines coated with basidia. Microscopically, the fungus produces longitudinally septate cruciate basidia typical of the order Auriculariales, releasing smooth, hyaline, broadly ellipsoid basidiospores.
Behavior and Ecology
Operating as a primary saprotrophic decomposer, Pseudohydnum gelatinosum breaks down cellulose and lignin within moist, decaying coniferous timber, particularly old-growth pine, spruce, and fir logs. Fruiting bodies typically emerge in late summer and autumn following sustained rains, utilizing their gelatinous tissue to absorb and retain ambient moisture in humid forest microclimates. The downward orientation of its conical teeth maximizes surface area for gravitational spore dispersal beneath the cap.
Conservation and Human Impact
With an extensive global range spanning Eurasia, the Americas, and Australasia, Pseudohydnum gelatinosum is assessed as Least Concern. While it is non-toxic and occasionally consumed candied or raw in salads due to its neutral flavor and crunchy gelatinous texture, it remains primarily celebrated by mycologists and naturalists as a fascinating morphological bridge between jelly fungi and hydnoid fungi. Sustainable woodland management that preserves coarse woody debris supports robust wild populations.
Interesting Factoid
The Toothed Jelly Fungus looks like a translucent rubber gummy bear covered in soft icicles underneath, and its jelly-like body can rehydrate and resume releasing spores even after partially drying out during brief dry spells.
Last updated: October 2026