06/Sep/2026, 2:20 PM
Kadrioru park, Tallinn, Harju, Eesti
Urban park, oak grove, on wet decaying acorn (Quercus robur) cap
59°26'22.9"N 24°47'41.8"E
🌡️ 15°C ⛅ Partly sunny 💨 Wind 290° WNW->ESE, 32 km/h
Original Instagram postHymenoscyphus fructigenus
Nut Disco
- Scientific identification
- Hymenoscyphus fructigenus (Bull.) Gray
- Family
- Helotiaceae
- Class
- Leotiomycetes
- Genus
- Hymenoscyphus
Names across languages
- English: Nut Disco
- German: Fruchtschalen-Becherling
- Finnish: Pähkinätiimakka
- Estonian: Tammetõru-pärispitsik
- Russian: Гименосцифус плодоволюбивый
The scientific profile
From the latest record: 2026-09-06.
Hymenium
Smooth fertile disc, whitish to cream or pale yellow-ochre; flat to slightly concave, becoming flatter with maturity
Apothecium
Minute, cup- to disc-shaped, soft and waxy; outer surface whitish, smooth to minutely downy
Hymenium Attachment
Exposed on upper surface of the apothecium
Stipe
Slender, cream to pale yellowish
Spore print
Spore print white
Ecology
Saprobic on fallen acorns, acorn cupules and other decaying nut shells, especially Quercus; also reported from Fagus, Corylus and Carpinus fruits; usually in small groups; late summer to autumn
Edibility
Inedible; extremely small
Fruit body
Fruit body tiny; stipe ~0.5–10 mm long
Dimensions
Apothecium ∅ ~0.5–4 mm
Flesh
Whitish to cream, thin, soft and waxy, unchanging when cut
Microscopy
Ascospores fusiform-ellipsoid, smooth, hyaline, ~13–21 × 3–5 µm, aseptate when young and sometimes 1-septate at maturity; asci cylindrical-clavate, 8-spored, ~80–140 × 7–10 µm, apical pore hemiamyloid; paraphyses filiform
Overview
Tiny pale stalked cups growing on fallen acorns and nut shells
1821). Nat. Arr. Brit. Pl. (London) 1: 673.
Field encounters
Source hashtags
#hymenoscyphusfructigenus #mushroomphotos #fungimacro #nutdisco #naturephotography
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