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

Spring fieldcap
Agrocybe praecox
📊 Comparing characteristics
| Characteristic | Agrocybe arvalis | 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
June – October
Spring fieldcap
Fruiting season
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
👀 Similar mushrooms — don't mix them up!
❓ Frequently asked questions
Can Spring fieldcap and Agrocybe arvalis be mixed up?
How to tell Spring fieldcap from Agrocybe arvalis?
Is Agrocybe arvalis edible?
When do Spring fieldcap and Agrocybe arvalis grow?
Sources
- [1]Вікіпедія (українська)
- [2]Атлас грибів України, Зеров Д.К. (1979)
- [3]MycoBank Database
- [4]Index Fungorum
- [5]GBIF
- [6]iNaturalist Ukraine