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Spring fieldcap or Agrocybe arvalis

How they differ, how to recognize them and which is more dangerous — a mushroom comparison

The short answer

Spring fieldcap and Agrocybe arvalis are similar species: Spring fieldcap is edible, while Agrocybe arvalis is inedible. The main visible difference: season: Spring fieldcap — spring, summer, Agrocybe arvalis — summer, autumn. The mushrooms also differ in the following features: use, size, cap color.

Agrocybe arvalis (Agrocybe arvalis)

Agrocybe arvalis

Agrocybe arvalis

InedibleExpert-verified
Spring fieldcap (Agrocybe praecox) from below against the light: crowded gills and a thin ring on a long pale stem

Spring fieldcap

Agrocybe praecox

EdibleExpert-verified

📊 Comparing characteristics

Comparison of characteristics: Agrocybe arvalis and Spring fieldcap
Edibility class

Agrocybe arvalis

Inedible

Spring fieldcap

Edible
Season

Agrocybe arvalis

SummerAutumn

Spring fieldcap

SpringSummer
Use

Agrocybe arvalis

Not eaten

Spring fieldcap

Cook fresh
Size

Agrocybe arvalis

Very small (<3 cm)

Spring fieldcap

Medium (5–15 cm)
Cap color

Agrocybe arvalis

Brown

Spring fieldcap

BrownYellow
Cap shape

Agrocybe arvalis

Convex

Spring fieldcap

Convex
Cap surface

Agrocybe arvalis

Smooth

Spring fieldcap

Smooth
Taste

Agrocybe arvalis

Unknown

Spring fieldcap

Mild
Smell

Agrocybe arvalis

Odorless

Spring fieldcap

Pleasant
Flesh color change

Agrocybe arvalis

No change

Spring fieldcap

No change
Hymenophore

Agrocybe arvalis

Gilled

Spring fieldcap

Gilled
Stem

Agrocybe arvalis

Bulbous

Spring fieldcap

Central
Ring (veil)

Agrocybe arvalis

No ring

Spring fieldcap

Ring present
Volva

Agrocybe arvalis

No volva

Spring fieldcap

No volva
Substrate

Agrocybe arvalis

Soil

Spring fieldcap

SoilForest litter
Nutrition type

Agrocybe arvalis

Saprotroph

Spring fieldcap

Saprotroph
Partner trees

Agrocybe arvalis

—

Spring fieldcap

OakBeechBirchHornbeam

📅 Seasonality

Agrocybe arvalis

Fruiting season

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

June – October

Spring fieldcap

Fruiting season

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

May – July

🔬 Morphology

Cap

Agrocybe arvalis

Small, 1.5–3 cm across. Bell-shaped in young mushrooms, opening wider with age. Light brown, evenly colored, with no distinctive spots or zoning. Surface smooth and dry.

Spring fieldcap

Up to 8 cm across. In young mushrooms whitish or yellowish in the center, turning ocher-brown or ocher-gray with time. The surface is smooth, convex at first, then opening out. Fleshy to the touch.

Hymenophore

Agrocybe arvalis

Gilled hymenophore. Gills narrow, attached to the stem, pale at first, turning brownish-rusty as they mature — from the color of the spore print.

Spring fieldcap

Gilled spore-bearing surface. In young mushrooms the gills are white, gradually darkening to brown — that is the spore color showing through.

Stem

Agrocybe arvalis

Thin and tall for such a small mushroom: 4–7 cm high but only 2–3 mm thick. Threadlike; at the base it runs down to a sclerotium — a firm, tuber-like knot in the soil from which the mushroom grows. No ring, no volva.

Spring fieldcap

Cylindrical, up to 8 cm tall. The upper part is white, the base brown. It has a narrow white ring — a key identification feature. No volva.

Flesh

Agrocybe arvalis

flesh thin, brittle, without any distinct color. No characteristic changes when cut.

Spring fieldcap

Thin, fleshy, without a strong color change when cut. Pale in a fresh mushroom.

Smell

Agrocybe arvalis

No distinct smell. The fresh mushroom lacks the strong notes that help you recognize other species — just an ordinary plant-like, mushroomy tone.

Spring fieldcap

Faintly mealy, like fresh flour.

📍 Habitats

Agrocybe arvalis

No data

Spring fieldcap

Deciduous forestMixed forest

👀 Similar mushrooms — don't mix them up!

❓ Frequently asked questions

Can Spring fieldcap and Agrocybe arvalis be mixed up?
Yes, they look so similar that people often mix them up. The season, use, size help tell them apart.
How to tell Spring fieldcap from Agrocybe arvalis?
The main differences: season: Spring fieldcap — spring, summer, Agrocybe arvalis — summer, autumn; use: Spring fieldcap — cook fresh, Agrocybe arvalis — not eaten; size: Spring fieldcap — medium (5–15 cm), Agrocybe arvalis — very small (<3 cm). As for edibility: Spring fieldcap is edible, Agrocybe arvalis is inedible. The full table of characteristics is higher up on this page.
Is Agrocybe arvalis edible?
Agrocybe arvalis — inedible.
When do Spring fieldcap and Agrocybe arvalis grow?
Spring fieldcap — May–July; Agrocybe arvalis — June–October.

Sources

  • [1]Вікіпедія (українська)
  • [2]Атлас грибів України, Зеров Д.К. (1979)
  • [3]MycoBank Database
  • [4]Index Fungorum
  • [5]GBIF
  • [6]iNaturalist Ukraine