Bisporella citrina (Batsch ex Fr.) Korf & Carpenter syn. Calycella citrina ([Hedwig.] Fr.) Boud. Lemon Disco Fruit body 0.5–3mm across, saucer-shaped tapered below to a small base, bright yellow becoming orange-yellow when old or dried, exterior smooth. Asci 135×10µ. Spores elliptical, containing two oil drops at each end, 9–14×3–5µ, often becoming one-septate. Habitat gregarious in dense swarms on dead wood of deciduous trees. Season autumn. Common. Not edible. Found In Europe and north America.