Yellow Fieldcap

Bolbitius titubans

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Mushrooms

Mushrooms

By Roger Phillips

Published 2006

Yellow Fieldcap Bolbitius titubans (Bull.) Fr. syn. B. vitellinus (Pers.) Fr. (illustrated 50% life size) Cap 1–4cm across, acorn-shaped then bell-shaped, finally expanding to almost flat; chrome-yellow at first, fading to grey-brown at the margin; , very thin and almost transparent, somewhat viscid when young, drying shiny with age, deeply grooved at the margin. Stem 30–100Γ—2–4mm; whitish-yellow, with a fine, mealy powdering, base downy; very delicate, hollow. Flesh thin and membranous above the gills. Gills crowded; pale yellow at first, later cinnamon or rusty. Spores 11–15Γ—6–9ΒΌ, elliptical, smooth. Spore print rust-brown. Habitat on rotting straw, manured grassland, or wood chips; summer to late autumn. Very common. Not edible.

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