22/Sep/2026 (🌅🌇), 5:26 PM
Laasu tee, Raudoja, Harju, Eesti
Mixed forest woodland edge, near gravel road, on lichenized birch tree branches
59°23'16.2"N 25°23'30.6"E
🌡️ 14°C ⛅ Passing clouds 💨 Wind 30° NNE->SSW, 17 km/h
Original Instagram postStereum hirsutum
Hairy Curtain Crust
- Scientific identification
- Stereum hirsutum (Willd.) Pers.
- Family
- Stereaceae
- Class
- Agaricomycetes
- Genus
- Stereum
Names across languages
- English: Hairy Curtain Crust
- German: Striegeliger Schichtpilz
- Finnish: Karvanahakka
- Estonian: Karvane nahkis
- Russian: Стереум жестковолосистый
The scientific profile
From the latest record: 2026-09-22.
Hymenium
Smooth, without pores or gills; yellow, ochre-yellow to yellow-brown or grey-brown, sometimes bruising darker yellow
Cap
Fan- to semicircular, thin and leathery, often fused laterally into overlapping tiers; concentrically zoned yellow, orange, buff to brown; densely velvety to hirsute when young, becoming smoother with age; margin thin and wavy
Hymenium Attachment
Smooth fertile surface covers the underside
Stipe
Absent; broadly attached and sessile
Spore print
Spore print white
Ecology
Saprobic, causing white rot on dead hardwood; fallen branches, trunks, stumps and standing dead wood; densely gregarious and often fused; persistent year-round
Ecology
Inedible; tough, leathery and tasteless
Fruit body
Fruit body small to medium; flesh ~0.5–1 mm thick
Dimensions
Cap width ~1–8 cm
Flesh
Whitish to pale ochraceous, very thin, tough and leathery, unchanging when cut
Chemical reactions
KOH red, often becoming black on cap and hymenium
Odour
Indistinct
Taste
Tasteless
Microscopy
Spores cylindrical to narrowly ellipsoid, smooth, hyaline, amyloid, ~5–8 × 2–3.5 µm; basidia 4-spored; hyphidia with rounded to subacute tips; acanthohyphidia absent; clamp connections absent
Overview
Hairy zoned hardwood curtain crust with a smooth yellow underside
1800). Observ. Mycol. (Lipsiae) 2: 90 (’1799′).
Field encounters
Source hashtags
#stereumhirsutum #mushroomphotos #fungimacro #hairycurtaincrust #naturephotography
Back to the collection · Photography and field notes by @fungarium.info