Giant polypore or Chicken of the woods
Giant polypore and Chicken of the woods are similar species that can be mixed up while foraging. The main visible difference: flesh colour change: Giant polypore — blackening, Chicken of the woods — no change. The mushrooms also differ in the following features: stem, cap surface, cap colour.
Not sure? Identify by photoSide by side
| Characteristic | Giant polypore | Chicken of the woods |
|---|---|---|
| Edibility class | Giant polypore: Conditionally edible | Chicken of the woods: Edible |
| Season | Giant polypore: Summer, Autumn | Chicken of the woods: Spring, Summer, Autumn |
| Use | Giant polypore: Cook fresh | Chicken of the woods: Cook fresh, Pickling |
| Cap colour | Giant polypore: Brown, Chestnut, Dark brown | Chicken of the woods: Yellow, Orange |
| Cap shape | Giant polypore: Irregular, Flat | Chicken of the woods: Flat |
| Cap surface | Giant polypore: Velvety, Scaly | Chicken of the woods: Smooth |
| Taste | Giant polypore: Sour | Chicken of the woods: Mild |
| Smell | Giant polypore: Odourless | Chicken of the woods: Pleasant |
| Flesh colour change | Giant polypore: Blackening | Chicken of the woods: No change |
| Stem | Giant polypore: Rooting, Lateral | Chicken of the woods: Absent |
| Substrate | Giant polypore: Living tree, Dead wood, On wood | Chicken of the woods: On wood, Living tree |
| Nutrition type | Giant polypore: Parasite, Saprotroph | Chicken of the woods: Parasite |
| Partner trees | Giant polypore: Beech, Oak, Linden, Poplar, Horse chestnut | Chicken of the woods: Oak, Aspen |
Same in both: size, hymenophore, growth habit.
When and where they meet
Together: July–October
What they look like
Cap, Hymenophore, Stem, Flesh, Smell
Cap
Giant polypore
The fruit body is made of many fan- or tongue-shaped caps overlapping on a shared base. Each cap is 10 to 30 cm wide and 1 to 3 cm thick, and the whole rosette is usually 50 to 80 cm across, sometimes over a metre, and can weigh tens of kilograms.
Young caps are yellow-brown to cinnamon, later chestnut brown with darker concentric zones and a paler cream margin. The surface is felty, finely fibrous or finely scaly. The margin is wavy, blunt and rounded when young, thinner with age.
Chicken of the woods
The fruiting body is bushy, with 5-30 overlapping fan-shaped caps on a shared base. Individual caps are 10-30 cm across and 6-30 cm tall, flat, spreading, fan-shaped and fleshy. The surface is smooth or finely felted; young caps glow yellow-orange, like fresh sulphur, and look glossy in wet weather. The colour is a striking sulphur-yellow to orange-yellow, typically shading from a rich orange centre to a yellow or cream margin. Older caps fade to pale yellow and cream.
Hymenophore
Giant polypore
The pore surface is white to cream, later dirty greyish. The pores are small and round, 3 to 5 per millimetre, and the short tubes, 4 to 6 mm deep, run slightly down the base.
The key feature: the pores quickly bruise brown and then black when touched or damaged. The spore print is white.
Chicken of the woods
The underside is a tube layer with fine sulphur-yellow pores (2-4 pores/mm), coloured sulphur-yellow to orange. Spore print: white.
Stem
Giant polypore
There's no true stem. The caps narrow into short stalk-like bases that merge into a shared, lumpy base, often rising from buried roots.
Chicken of the woods
No distinct stem — the caps attach to the substrate by a broad base or a short lateral stem.
Flesh
Giant polypore
The flesh is white, sometimes pinkish. It's soft and juicy only when very young, then fibrous and almost leathery. When cut it turns reddish, then black.
Chicken of the woods
In young brackets the flesh is tender, meaty, juicy and cream-yellow, much like chicken breast. In old ones it's tough, leathery, fibrous and inedible. It doesn't change colour when cut. The smell is distinctive, sourish-fruity and mushroomy, with a hint of fresh cucumber, and the taste is mild and delicately mushroomy, with a hint of chicken.
Smell
Giant polypore
The smell isn't distinctive. The taste is slightly sour, especially in older fruit bodies.
Chicken of the woods
A distinctive sourish-fruity smell with a hint of fresh cucumber, and an easy one to recognise.
Related comparisons
Sources · 18
- [1]Index Fungorum
- [2]GBIF
- [3]Wikipedia (English)
- [4]Википедия (русская)
- [5]Наказ Мінприроди № 111 від 15.02.2021 про Червону книгу України
- [6]First Nature: Meripilus giganteus, Giant Polypore
- [7]Wikipedia (de): Riesenporling
- [8]Wild Food UK: Blackening Polypore
- [9]The Foraging Course Company: Foraging guide, Giant Polypore
- [10]Reinartz H., Schlag M., Wessolly L. Schadwirkung und Beurteilung des Riesenporlingbefalls an Buche. Stadt und Grün, Reinartz H., Schlag M., Wessolly L.
- [11]Monmouthshire County Council: safety work planned for diseased beech tree in Bailey Park, Abergavenny (06.02.2026)
- [12]Новгородський, Бондаренко. Знахідка Meripilus giganteus у Бережанському дендропарку, 2022 (тези, ХНУ ім. В.Н. Каразіна), Новгородський, Бондаренко (2022)
- [13]GBIF: знахідки Meripilus giganteus в Україні
- [14]Wikigrib: Мерипилус гигантский
- [15]Вікіпедія (українська)
- [16]Атлас грибів України, Зеров Д.К. (1979)
- [17]MycoBank Database
- [18]iNaturalist Ukraine