Greasy green brittlegill or Green brittlegill
How they differ, how to recognize them and which is more dangerous — a mushroom comparison
The short answer
Greasy green brittlegill and Green brittlegill are similar species that can be mixed up while foraging. The main visible difference: use: Greasy green brittlegill — cook fresh, pickling, drying, Green brittlegill — cook fresh, pickling. The mushrooms also differ in the following features: cap color, flesh color change, partner trees.

Greasy green brittlegill
Russula heterophylla

Green brittlegill
Russula aeruginea
📊 Comparing characteristics
| Characteristic | Greasy green brittlegill | Green brittlegill |
|---|---|---|
| Edibility class | Greasy green brittlegill Edible | Green brittlegill Edible |
| Season | Greasy green brittlegill SummerAutumn | Green brittlegill SummerAutumn |
| Use | Greasy green brittlegill Cook freshPicklingDrying | Green brittlegill Cook freshPickling |
| Size | Greasy green brittlegill Medium (5–15 cm) | Green brittlegill Medium (5–15 cm) |
| Cap color | Greasy green brittlegill OliveBrown | Green brittlegill Olive |
| Cap shape | Greasy green brittlegill Depressed | Green brittlegill Depressed |
| Cap surface | Greasy green brittlegill Smooth | Green brittlegill Smooth |
| Taste | Greasy green brittlegill Mild | Green brittlegill Mild |
| Smell | Greasy green brittlegill Pleasant | Green brittlegill Pleasant |
| Flesh color change | Greasy green brittlegill Reddening | Green brittlegill Yellowing |
| Hymenophore | Greasy green brittlegill Gilled | Green brittlegill Gilled |
| Stem | Greasy green brittlegill Central | Green brittlegill Central |
| Ring (veil) | Greasy green brittlegill No ring | Green brittlegill No ring |
| Volva | Greasy green brittlegill No volva | Green brittlegill No volva |
| Substrate | Greasy green brittlegill Soil | Green brittlegill Soil |
| Nutrition type | Greasy green brittlegill Mycorrhizal | Green brittlegill Mycorrhizal |
| Partner trees | Greasy green brittlegill OakBeechHornbeamBirch | Green brittlegill BirchPine |
📅 Seasonality
Greasy green brittlegill
Fruiting season
July – October
Green brittlegill
Fruiting season
July – October
🔬 Morphology
Cap
Greasy green brittlegill
Cap 5-12 cm across, when young convex with an inrolled margin, with age becoming flattened with a slightly depressed center. The cap skin is smooth, slimy in wet weather, dry and matte in dry weather, peels easily 2/3 of the way to the center. Color green-olive, olive-gray, gray-brown, deeper in the center to dark green. Mature caps have fine radial grooves at the margin.
Green brittlegill
Cap 5-10 cm across, when young convex with an inrolled margin, with age becoming flattened with a slightly depressed center. The cap skin is smooth, slimy in wet weather, dry and matte in dry weather, peels easily 2/3 of the way to the center. Color: gray-green, grass-green, olive-green, deeper toward dark green at the center, paler toward the margin and fading to grayish. In mature specimens the margin has fine radial grooves.
Hymenophore
Greasy green brittlegill
Gilled hymenophore — gills adnate or free from the stem, moderately crowded, thin, with characteristic forking near the stem — a diagnostic trait. Color pure white to creamy white. Spore print white.
Green brittlegill
Gilled hymenophore — the gills are attached or free from the stem, moderately crowded, thin, brittle. Color: white at first, cream with a pale ochre tinge with age. Spore print creamy white to pale ochre.
Stem
Greasy green brittlegill
Stem 4-8 cm tall, 1.5-2.5 cm thick, firm, cylindrical, hollow in old specimens. Color white to cream, with faint gray-cream patches in old specimens. Surface smooth with fine lengthwise wrinkles. No ring, no volva.
Green brittlegill
Stem 4-8 cm tall, 1-2 cm thick, firm, cylindrical, hollow inside in old specimens. Color: white to creamy white, without noticeable spots. Surface smooth with fine lengthwise wrinkles. No ring, no volva — a key distinguishing feature from the death cap.
Flesh
Greasy green brittlegill
Flesh firm, brittle, white, turns faintly pink when damaged — a reaction typical of the species. Smell faint, pleasant, fruity-mushroomy, taste mild, sweetish and nutty, not bitter (tongue test).
Green brittlegill
Flesh firm, brittle, white, when cut does not change color or slowly turns yellow. Smell faint, pleasant, fruity-mushroomy, taste mild, with no bitterness or acridity (tongue test).
Smell
Greasy green brittlegill
Faint, pleasant, fruity-mushroomy, neutral-sweetish.
Green brittlegill
Faint, pleasant, fruity-mushroomy, nothing sharp.
📍 Habitats
Greasy green brittlegill
Green brittlegill
👀 Similar mushrooms — don't mix them up!
❓ Frequently asked questions
Can Greasy green brittlegill and Green brittlegill be mixed up?
How to tell Greasy green brittlegill from Green brittlegill?
Is Green brittlegill edible?
When do Greasy green brittlegill and Green brittlegill grow?
Sources
- [1]Вікіпедія (українська)
- [2]Атлас грибів України, Зеров Д.К. (1979)
- [3]MycoBank Database
- [4]Index Fungorum
- [5]GBIF
- [6]iNaturalist Ukraine