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Partner trees

Birch

Birch — mushrooms with the trait «Birch»

A bright birch grove is one of the most promising places for "quiet hunting". Birch is a versatile and extremely active mycorrhizal partner, linked to dozens of the most valuable edible and the most recognizable poisonous mushrooms of our climate zone.

24 species in the database.

Mycorrhizal links and companion mushrooms of birch

The root system of birch (Betula) forms ectomycorrhiza with a huge number of macrofungi. In her "Key to the Fungi of Ukraine", M.Ya. Zerova points out that some mushrooms are strictly bound to this tree, which is often reflected even in their names.

In his guide «Mushrooms», Roger Phillips details the best-known mycorrhizal partnerships of birch:

1. Brown birch boletes (Leccinum scabrum): An absolute marker of birch. These mushrooms with their characteristic scaly stem never grow without birch roots nearby.

2. Birch porcini (Boletus edulis var. betulicola): A separate form of porcini that stands out with a paler, almost whitish cap and is firmly tied to birch forests.

3. Woolly milk cap (Lactarius torminosus): A popular mushroom for salting, with a fluffy cap margin. It is a strict mycorrhizal partner of birch.

4. Brittlegills (Russula): Dozens of brittlegill species (for example, the yellow swamp brittlegill — Russula claroflava) prefer birch stands.

In «Mushrooms Demystified», David Arora pays special attention to the dangerous and inedible mushrooms that accompany birch. The main visual symbol of a birch forest is often the fly agaric (Amanita muscaria), a classic mycorrhizal partner of birch. Foragers often treat its presence in the forest as an "indicator" of the right soil for porcini. The deadly poisonous death cap can also form a symbiosis with birch.

Besides mycorrhizal species, the living and dead wood of birch hosts the famous parasitic chaga (Inonotus obliquus) and the saprotrophic birch polypore (Fomitopsis betulina), both widely used in folk medicine.

Questions and answers

Why does the brown birch bolete grow only under birch?
The brown birch bolete (Leccinum scabrum) is an obligate mycorrhizal symbiont. Its mycelium is evolutionarily tuned to exchange nutrients exclusively with the root system of trees of the genus Betula. Without chemical signals from birch roots, brown birch bolete spores will not even grow into a full mycelium.
Does finding fly agarics mean there are porcini nearby?
Yes, there is a good chance. The fly agaric and birch porcini often have similar soil requirements (acidity, moisture), and both form mycorrhiza with birch. If you see fly agarics, it means the mycorrhizal network in that spot is active.
How do you tell chaga from an ordinary bracket fungus on birch?
True chaga looks like a shapeless, black, charcoal-like, deeply cracked growth on a living birch trunk. Bracket fungi (for example, the birch polypore) have a more regular "hoof" or "shelf" shape with a pale, gray or brown smooth surface.
Do chanterelles grow under birches?
Yes. The chanterelle (Cantharellus cibarius) is extremely adaptable ecologically and can form mycorrhiza with both conifers (pine, spruce) and broadleaf trees, including birch.

Sources

  1. 1.Зерова М.Я. та ін. Визначник грибів України. 1979
  2. 2.Roger Phillips. Mushrooms (Roger Phillips)
  3. 3.David Arora. Mushrooms Demystified
  4. 4.Index Fungorum