Green brittlegillRussula aeruginea
Expert-verifiedUpdated October 3, 2026
Passport
- Edibility
- Edible
- Season
- Jul — Oct
- Hymenophore
- Gilled
- Cap color
- Olive
- Size
- Medium (5–15 cm)
- Smell
- Pleasant
- Reviewed
- Yes ✓
Quick answers
Where to look?
Deciduous forest, Mixed forest
When does it appear?
Jul — Oct
Active months: July, August, September, October.
How to recognize it? Three signs
- Cap color: Olive
- Cap shape: Depressed
- Smell: Pleasant
Fruiting season
July – October
Description
The green brittlegill (Russula aeruginea, synonym — R. graminicolor) is a widespread edible brittlegill of birch and mixed forests with a distinctive gray-green or grass-green cap. The Latin epithet aeruginea means "copper-greenish, verdigris-green" (from aerugo — "copper green, patina") — an exact description of the color. The cap is 5-10 cm across, convex when young, becoming flattened with a slightly depressed center with age, gray-green, grass-green, olive-green, deeper at the center, paler toward the margin.
Edible, of moderately good culinary quality — the flesh is tender, mild and not bitter; after boiling it's great for frying, pickling and soups. Foragers don't pick it very actively because it's not that common and its dull color blends into grass and moss, but it's genuinely valuable as one of the "green" species that round out your basket.
The key thing is to reliably tell it apart from the deadly poisonous death cap (Amanita phalloides), which when young has a greenish olive cap, very similar in overall color. The crucial differences: Russula aeruginea — NO ring on the stem, NO volva at the base Death cap — HAS a ring and a sac-like VOLVA at the stem base (often hidden in the soil — always dig it out) Russula spore print — WHITE to cream, the death cap's is also white, so this is NOT diagnostic Russula flesh is brittle, like crumbly fried dough; the death cap's is springy, like leather Russula smell is neutral-fruity; the death cap's is sickly sweet
The iron rule: always dig every mushroom out of the litter together with the base of the stem before picking it. If there's a sac-like volva, it's not a brittlegill!
Diagnostic features of Russula aeruginea: (1) gray-green cap color with an olive tone; (2) the cap skin peels easily up to 2/3 of the way; (3) spore print creamy white to pale ochre; (4) taste mild, not bitter (tongue test); (5) smell faintly fruity; (6) grows under birch and in mixed forests.
In Ukraine, Russula aeruginea is common in birch and mixed forests: the Carpathians, Prykarpattia, Polissia and the forest-steppe. A mycorrhizal partner of birch. Season: July — October.
Cap
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
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
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
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
Faint, pleasant, fruity-mushroomy, nothing sharp.
Lookalikes
Related species
Mushrooms of the same genus and habitat — to study side by side and never mix up.
Bare-toothed russula
Russula vesca
Copper brittlegill
Russula decolorans
Crab brittlegill
Russula xerampelina
Golden brittlegill
Russula lutea
Hintapink
Russula paludosa
Humpback brittlegill
Russula caerulea
Milk-white brittlegill
Russula delica
Ochre brittlegill
Russula ochroleuca
Frequently asked questions
How can you reliably tell it from the deadly poisonous death cap?
MANDATORY RULE — dig the whole mushroom out of the litter, right down to the stem base. (1) Death cap — HAS a sac-like VOLVA at the stem base (often hidden in the soil); (2) HAS a RING on the upper part of the stem; (3) Flesh springy, like leather; (4) Smell sickly sweet in mature ones. Russula aeruginea — NO volva, NO ring, flesh brittle and crumbly, smell neutral-fruity. If there's even a hint of a sac or a ring — DON'T TAKE IT, even if the color is identical.
How do you cook it?
A short 5-10 min boil for beginners, then fry with onion, add to soups, pickle. Culinary value is moderate — it works well in a mix with more aromatic mushrooms. Pickles fine and holds its shape. Drying is so-so; the aroma is average.
Does it have other dangerous lookalikes?
Besides Amanita phalloides — Amanita citrina (false death cap), it has a greenish-yellow cap, a ring and a volva, inedible (not poisonous, but unpleasant). Tricholoma equestre (yellow knight) — more yellowish-green, no ring, with a risk of rhabdomyolysis (muscle breakdown: muscle weakness and pain, dark urine) after repeated meals. Russula virescens (greencracked brittlegill) — also green, but with a distinctive scaly, mirror-like cap.
Where should you look for it?
Mostly in birch and mixed forests (birch-pine, birch-spruce) in the forest litter among moss and grass. It likes slightly acidic and neutral soils.
Which regions of Ukraine is it found in?
Common throughout the forest zone: the Carpathians, Prykarpattia, Polissia and the forest-steppe. In the steppe — in birch shelterbelts and ravine (bairak) woods.
When should you look for it?
July — October, peaking in August–September.
Which brittlegills is it confused with?
With R. virescens (greencracked brittlegill) — edible, but with a scaly, cracked, "marbled" cap skin (R. aeruginea's is smooth); R. virescens has the better culinary quality. With R. cyanoxantha (charcoal burner) — violet-green with a violet tinge.
Is Green brittlegill edible or poisonous?
Does Green brittlegill have gills or pores?
What does the cap of Green brittlegill look like?
What does the stem of Green brittlegill look like?
What do Green brittlegill smell and taste like?
Sources
- [1]Вікіпедія (українська)
- [2]Атлас грибів України, Зеров Д.К. (1979)
- [3]MycoBank Database
- [4]Index Fungorum
- [5]GBIF
- [6]iNaturalist Ukraine