Support MycoNote →

MycoNote

Giant polypore or Chicken of the woods

All about Giant polypore
All about 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 photo

Side by side

Giant polyporeChicken of the woods
Comparison of characteristics: Giant polypore and Chicken of the woods
Edibility classGiant polypore: Conditionally edibleChicken of the woods: Edible
SeasonGiant polypore: Summer, AutumnChicken of the woods: Spring, Summer, Autumn
UseGiant polypore: Cook freshChicken of the woods: Cook fresh, Pickling
Cap colourGiant polypore: Brown, Chestnut, Dark brownChicken of the woods: Yellow, Orange
Cap shapeGiant polypore: Irregular, FlatChicken of the woods: Flat
Cap surfaceGiant polypore: Velvety, ScalyChicken of the woods: Smooth
TasteGiant polypore: SourChicken of the woods: Mild
SmellGiant polypore: OdourlessChicken of the woods: Pleasant
Flesh colour changeGiant polypore: BlackeningChicken of the woods: No change
StemGiant polypore: Rooting, LateralChicken of the woods: Absent
SubstrateGiant polypore: Living tree, Dead wood, On woodChicken of the woods: On wood, Living tree
Nutrition typeGiant polypore: Parasite, SaprotrophChicken of the woods: Parasite
Partner treesGiant polypore: Beech, Oak, Linden, Poplar, Horse chestnutChicken of the woods: Oak, Aspen

Same in both: size, hymenophore, growth habit.

When and where they meet

Together: July–October

Their seasons overlap: July–October. At that time you can find both in the same woods. Shared habitats: deciduous forest.

Giant polypore

Fruiting season

July – November

Chicken of the woods

Fruiting season

April – 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