Spectacular Rustgill vs Jack O'Lantern Mushroom
Gymnopilus junonius compared with Omphalotus olearius — how to tell them apart in the field.
This is a dangerous confusion.
At least one of these species is toxic. Never eat a wild mushroom based on a photo comparison alone — verify with local experts.
Spectacular Rustgill
Gymnopilus junonius
ToxicPsychoactive
Jack O'Lantern Mushroom
Omphalotus olearius
Toxic
How to Tell Them Apart
Toxic. Also orange, also grows in clusters at the base of trees. Jack O'Lanterns have true decurrent gills that run down the stem, a cream to pale yellow spore print, and lack the ring. Gymnopilus has attached gills, a prominent ring, and a rusty orange spore print.
Side-by-Side Identification
| Trait | Spectacular Rustgill | Jack O'Lantern Mushroom |
|---|---|---|
| Cap | 5-18 cm across. Convex, expanding to broadly convex or nearly flat. Bright golden-orange to tawny-orange, sometimes with a slightly darker center. Surface is dry, smooth to slightly fibrillose or scaly. Flesh is thick, firm, and yellow. | 4–20 cm across. Convex when young, flattening out and often developing a shallow funnel shape with age. Bright orange to orange-yellow, smooth surface without scales or warts. The margin can become wavy and irregular in older specimens. |
| Gills | Attached (adnate to slightly decurrent). Bright yellow when young, becoming rusty orange-brown as spores mature. Crowded. Edges may be slightly uneven. | True gills (not the false ridges of chanterelles) — thin, closely spaced, and decurrent (running down the stem). Orange to yellow-orange. These are what glow in the dark. If you peel a gill away cleanly with a knife, it's a Jack O'Lantern. Chanterelle ridges are blunt and forked. |
| Stem | 5-15 cm tall, 1-3 cm thick. Solid, firm, yellow to orange-brown. Has a membranous ring (annulus) in the upper portion that is often stained rusty by deposited spores. Base often slightly swollen. Flesh is yellow and fibrous. | 5–13 cm tall, solid (not hollow), tapering toward the base. Same orange color as the cap. Often curved because the clusters grow in tight bunches and compete for space. No ring. |
| Spore print | Rusty orange to bright orange-brown. | Creamy white to pale yellow. |
| Odor | Not distinctive, sometimes faintly mealy. The taste is intensely and persistently bitter, which is a key identification feature. | Mildly sweet, sometimes described as unpleasant when old. |
| Habitat | Saprotrophic, occasionally weakly parasitic. Grows in dense clusters at the base of hardwood stumps and logs, especially oak, beech, and maple. Also found on buried roots, causing it to appear to grow from the ground. Occasionally on conifers. Common in deciduous and mixed forests, parks, and urban tree plantings. | Grows on dead or dying hardwood — especially oak, but also beech, chestnut, and olive trees. Fruits from buried roots, stumps, or the base of living trees. Often appears to grow from soil, but there's always wood underneath. Found in deciduous and mixed forests, parks, and yards. |
| Season | Autumn, typically September through November in temperate regions. Peak fruiting in October after sustained autumn rains. Can appear earlier or later depending on local conditions. | Late summer through late autumn. Peak season is September–November in most areas. |
Found one of these in the wild? Don't rely on memory — identify it from a photo with Orangutany and check it against both species before you touch it.