How to tell Deceiver from Split fibrecap
How they differ, how to recognize them and which is more dangerous — a mushroom comparison
Warning: Split fibrecap(Pseudosperma rimosum)
POISONOUS
Eating it causes poisoning. Do not pick it unless you have identified it with certainty.
Toxin: muscarine (high concentration — up to 0.2% of dry weight, 100-200 times more than in the fly agaric). Symptoms start 15-90 min after the meal (fast). The classic "muscarinic syndrome" (PSL — "perspiration, salivation, lacrimation"): profuse salivation, heavy sweating, watering eyes, runny nose, constricted pupils (miosis), bronchospasm, bradycardia, low blood pressure, intestinal cramps, diarrhea, nausea, vomiting. Lasts 4-12 hours. In severe cases — collapse, pulmonary edema, risk of cardiac arrest. The antidote is atropine, which blocks muscarine at the muscarinic receptors. Treated only in a hospital — self-treatment with atropine is dangerous. If you suspect poisoning, call 112 or your local emergency number immediately and keep the mushroom leftovers and vomit. The prognosis is good with timely treatment.
If you suspect poisoning, call an ambulance immediately: 112 (the European emergency number) or your local emergency number
The short answer
Deceiver and Split fibrecap look alike, so they're easy to mix up — but Deceiver is edible, while Split fibrecap is poisonous. The main visible difference: use: Deceiver — cook fresh, Split fibrecap — not eaten. The mushrooms also differ in the following features: cap color, cap shape, cap surface. If you have even the slightest doubt, leave the mushroom be.
Split fibrecap
Pseudosperma rimosum
Deceiver
Laccaria laccata
📊 Comparing characteristics
⚠ Highlighted rows are the key differences between the edible and the dangerous mushroom
| Characteristic | Split fibrecap | Deceiver |
|---|---|---|
| ⚠ Edibility class | Split fibrecap Poisonous | Deceiver Edible |
| Season | Split fibrecap SummerAutumn | Deceiver SummerAutumn |
| ⚠ Use | Split fibrecap Not eaten | Deceiver Cook fresh |
| Size | Split fibrecap Small (up to 5 cm) | Deceiver Small (up to 5 cm) |
| ⚠ Cap color | Split fibrecap YellowOrangeBrown | Deceiver OrangeBrownRed |
| ⚠ Cap shape | Split fibrecap Conical | Deceiver Convex |
| ⚠ Cap surface | Split fibrecap Cracked | Deceiver Smooth |
| Taste | Split fibrecap Mild | Deceiver Mild |
| ⚠ Smell | Split fibrecap Chemical | Deceiver Odorless |
| Flesh color change | Split fibrecap No change | Deceiver No change |
| Hymenophore | Split fibrecap Gilled | Deceiver Gilled |
| Stem | Split fibrecap Central | Deceiver Central |
| Ring (veil) | Split fibrecap No ring | Deceiver No ring |
| Volva | Split fibrecap No volva | Deceiver No volva |
| ⚠ Substrate | Split fibrecap Soil | Deceiver SoilMossForest litter |
| Nutrition type | Split fibrecap Mycorrhizal | Deceiver Mycorrhizal |
| ⚠ Partner trees | Split fibrecap OakBeechHornbeamBirchHazel | Deceiver OakBeechSpruceBirchPine |
📅 Seasonality
Split fibrecap
Fruiting season
June – October
Deceiver
Fruiting season
August – November
🔬 Morphology
Cap
Split fibrecap
Cap 2-7 cm across; in young mushrooms conical or bell-shaped with a pointed knob, later it opens out, but the knob stays. Color yellowish-ochre, straw-yellow, light brown in old mushrooms. The surface has a distinctive radially fibrous pattern, and when mature — deep radial cracks from the center to the edge (hence the species name rimosum — "cracked"). The margin is often split and upturned.
Deceiver
The cap is small: 2-5 cm across, convex in young mushrooms, later flattening out or becoming depressed with a thin, wavy edge. The color is rusty-orange, cinnamon-brick, reddish-brown; in wet weather darker and richer, in dry weather paler and faded (hygrophanous). The surface is silky-matte and smooth; the edge often has fine radial striations.
Hymenophore
Split fibrecap
Gilled hymenophore. Gills fairly crowded, notched where they meet the stem. In young mushrooms they are whitish-gray, turning olive-brown or tobacco-colored with age. Spore print tobacco-brown or tobacco-colored — typical of the whole genus Inocybe.
Deceiver
Gilled hymenophore. The gills are widely spaced and thick, attached or slightly decurrent. Their color echoes the cap: pinkish-orange, cinnamon in old mushrooms, with a characteristic whitish, floury bloom (spores). The spore print is white.
Stem
Split fibrecap
Stem 3-8 cm tall, 0.4-1 cm thick, cylindrical, even or slightly thickened toward the base. Whitish to yellowish, paler at the top. Surface lengthwise fibrous, no ring. Flesh of the stem firm, hollow in old mushrooms.
Deceiver
Stem 3-7 cm tall, 0.3-0.6 cm thick, slender, cylindrical, often curved. The color is rusty-orange, matching the cap, lengthwise fibrous. At the base — white mycelial fuzz. No ring. The stem becomes hollow in old mushrooms.
Flesh
Split fibrecap
Flesh thin, whitish to yellowish, does not change color when cut.
Deceiver
Flesh thin, rusty-cream, soft. Doesn't change color when cut. No pronounced taste.
Smell
Split fibrecap
Distinctly spermatic or stale and musty — typical of the whole genus Inocybe. This is an important diagnostic sign: if an unknown brownish mushroom has this unpleasant smell, throw it away without hesitation. Some sources describe the smell as "stale flour". The taste is mild or slightly bitter — do NOT rely on taste.
Deceiver
Faint, neutral mushroomy, with no particular notes. Taste mild, not pronounced.
📍 Habitats
Split fibrecap
Deceiver
👀 Similar mushrooms — don't mix them up!
❓ Frequently asked questions
Can Deceiver and Split fibrecap be mixed up?
How to tell Deceiver from Split fibrecap?
Which is more dangerous — Deceiver or Split fibrecap?
Is Split fibrecap edible?
When do Deceiver and Split fibrecap grow?
Sources
- [1]Вікіпедія (українська)
- [2]Атлас грибів України, Зеров Д.К. (1979)
- [3]MycoBank Database
- [4]Index Fungorum
- [5]GBIF
- [6]iNaturalist Ukraine