Category Archives: Fungus

The Fungus sub-category includes all posts to do with Fungi, Mushrooms or Mycelia.


All posts are included whether edible or not. I will do my best to make sure that all information is accurate and up to date, but you should be 100% sure yourself before picking mushrooms.

Birch Polypore (Pitptoporus betulinus)

Large Birch Polypore

Large Birch Polypore

This polypore is quite an incredible fungus, well worth knowing how to identify it, and definitely worth harvesting for its health benefits (the usual rules of collection apply). The first time I was certain that this was what I was looking at, I was very excited and like most of these things, when you’ve positively identified it once, you see them all the time.

Other Names

Pitptoporus betulinus – Piptoporus comes from the latin meaning ‘pores cast down’ and betulinus from its host tree, the birch.
It is also known as birch conk, birch bracket, and razor strop fungus. The razor strop comes from the fact that it has been used as a tool to get that final extra sharp edge on your knife, and has been used by barbers for their cut-throat razors. The name polypore refers to its many pores, situated on the underside of the fruiting body from which the spores are released.


It is edible, but it has quite a bitter aftertaste so it’s not the most desirable for food, but it is not poisonous.


Birch tree with Birch Polypore

Birch tree with Birch Polypore

Dead Birch tree with Birch Polypore

Dead Birch tree with Birch Polypore








Birch Polypore are brown on top, and white underneath with many spore holes. They grow on dead or dying Birch trees, and they erupt from the surface of the trunk. It has a rich, mushroomy smell, but opinions are divided on that – you’ll have to make up your own mind. I’ve also heard it said that infected trees smell strongly of green apples, but I have yet to experience that. The birch polypore grows from a single lateral attachment point on birch trees, being a small white ball at first, then expanding to a bracket measuring approximately 10-20 cm across. It is white to begin with, the cap changing to a beige/tan colour and then darkening or greying with age. The underside is white and contains many pores which release their spores into the air.

Birch Polypore Underside

Birch Polypore Underside

Spores land on exposed areas of birch trees, where branches have broken for example, and  grow hyphae which spread to form the mycelial network through the tree. It is considered weakly parasitic on birch trees, a healthy tree will be able to contain the spreading hyphae; but in one that is aged or diseased the fungus will begin the gradual process of breaking it down. The fruiting bodies are annual, unlike some of our other common bracket fungi which may live for years, but they are often gnawed by insects before the end of this period so they are better picked young.


Birch polypore grows freely in the temperate forests of Europe and also North America and its ethno-botanic uses have been wide and varied. From medicine to tinder, knife sharpener and sweat band, this fungi has been employed in many more ways than your average mushroom. Like the more famous tinder fungus, Fomes fomentarius, it is able to carry a spark from one campsite another, easing the task of firelighting, and in more recent times it was cut into strips and used to sharpen knives, especially by those who could not afford leather, giving it its common name, the razor strop fungus.

Otzi birch polypore

Otzi birch polypore

It became very well known after it was found on the body of Ötzi’, a 5300 year old mummy found preserved in the ice in the Italian Alps. Amongst his kit Ötzi’ carried two strips of hide onto which had been threaded pieces of birch polypore. As he was later found at autopsy to be infected with intestinal parasites against which the birch polypore is active, it has been theorised that he was carrying them as treatment and also as a possible anti-septic incase of minor injuries.

Medicinal Uses

As I’ve already said, medicinally, this is an amazing polypore. Its properties as an anti-inflammatory, anti-septic, anti-bacterial and styptic properties alone make it really good for making a immune tonic or tea to be taken once a week to boost your immune system. Birch polypore contains primary metabolites (polysaccharides) and secondary metabolites (such as triterpenes) that are beneficial for health. Research also backs up its traditional uses.

However, research has also shown that the natural compounds in this fungus can be effective in fighting HIV and Cancer! Yes, really.

It has been shown to be a useful support in the treatment of cancer in a number of ways. Alongside providing general support to the immune system, it also inhibits angiogenesis, the formation of new blood cells which occurs in tumour growth. In one study anti-cancer effects were “attributed to decreased tumor cell proliferation, motility and the induction of morphological changes. Of note is the fact that it produced no or low toxicity in tested normal cells.”

(1) Another in vitro study on colorectal cancer showed that “Studied extracts highly decreased the viability of cancer cells, slightly inhibiting proliferation and tumor cell adhesion in a time- and dose-dependent manner.” (2) It also found that the extracts studied had very low toxicity to normal cells making it a safe and effective treatment.

One facet of the birch polypore’s healing actions is the concentration of betulinic acid which it potentiates from it’s host tree. Betulinic acid has been shown in various studies to initiate apoptosis, or death of cancer cells. (3) In 2001, an extract of birch polypore containing betulinic acid showed useful antiviral action against HIV by blocking its reproduction. (4)

How to use Birch Polypore as an immune boosting tonic/tea


Mushrooms don’t keep for very long once you’ve picked them, so how you keep them is important. Drying is the best method to keep them for longer and have them still be useful. Once dried you can keep them in a paper bag, or a sealed jar in a dry place, out of direct sunlight.


My favourite way of using Birch Polypores is in a tea, which can also be frozen so I’ll usually make up a load of it, and put some into ice cube trays to use in the future.
Being a fungus, and not tea leaves, it’s not enough to put some pieces on hot water. Therefore, you need to put your fungus into gently simmering water for an hour. You can make 1 cup of tea/tonic with 6 to 8 grams of mushroom; So weigh your polypore pieces and adjust accordingly to make a batch.
Sometimes, the taste can still be a little bitter, so why not freeze the extra into ice cubes. You can drop these into soups, stews, gravy etc. to disguise the taste but still get the health benefits.

Other uses

As well as a razor strop and sticking plaster, as mentioned earlier, apparently it has also been used for the fine polishing of metals, making ink blotters, and for mounting insect collections. One use that would have been important in ancient times, is that it takes a spark well, and can be used to carry fire over long distances. Therefore allowing people to move around without the hassle of fire-lighting from scratch.


  1. Lemieszek et al – Anticancer Effect of Fraction Isolated from Medicinal Birch Polypore Mushroom, Piptoporus betulinus – Int. Journal of Medicinal Mushrooms. 2009; 11(4): pages 351-364.
  2. Cyranka M et al –. Investigation of antiproliferative effect of ether and ethanol extracts of birch polypore medicinal mushroom, Piptoporus betulinus Int. Journal of Medicinal Mushrooms 2011;13(6): pages 525-33.
  3. Fulda S – Modulation of Apoptosis by Natural Products for Cancer Therapy -Planta Med 2010; 76(11): 1075-1079.
  4. Kanamoto T. et al –. Anti-human immunodeficiency virus activity of YI-FH 312 (a betulinic acid derivative), a novel compound blocking viral maturation –. Antimicrobial Agents and Chemotherapy 2001; 45(4): pages 1225-1230.
  5. Kawagishi H. – Novel hydroquinone as a matrix metallo-proteinase inhibitor from the mushroom, Piptoporus betulinus – Biosci Biotechnol Biochem. 2002; 66(12): pages -2748-2750.
  6. Kemani Wangun et al. – Anti-inflammatory and Anti-hyaluronate Lyase Activities of Lanostanoids from Piptoporus betulinus – The Journal of Antibiotics. 2004; 57 (11): pages 755-758.
  7. Kamo T. et al – Anti-inflammatory lanostane-type triterpene acids from Piptoporus betulinus – Journal Nat Prod 2003 66 (8): pages 1104-1106.

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Turkey Tail Fungus

On a recent trip to Epping Forest, I came across some bracket fungus growing on an old log pile. I didn’t know what it was at the time, so I took some pictures with the intention of identifying it later.

Turkey Tail Fungus

Turkey Tail Fungus

Turkey Tail Fungus on old logs

Turkey Tail Fungus on old logs

So here I am and it looks like it was Turkey Tail Fungus, one of the polypore mushrooms. It has many pores on the underside instead of gills to distribute its spores.

Can you eat it?

I’ve done a bit of research and I’ve found that whilst it’s not dangerous to eat, it is tough and tasteless, so not worth the effort.

So is it any use?

Well, according to many reputable sources, Turkey Tail fungus (Trametes versicolor) is very useful as a medicinal. A simple internet search brings up many brands of Turkey Tail fungus extracts for multiple ailments all around the world.

Cancer fighting

The big news appears to be that Turkey Tail fungus could be useful alongside conventional therapies for fighting cancer ( Apparently it has good immune system boosting properties. However, due to the fact that it has been used widely for a long time, it is unlikely that it could be patented, therefore the pharmaceutical companies wouldn’t be able to make money out of it, so research is unlikely to continue to be funded.
Some websites claim that studies in Asia have found that it can double the life expectancy of cancer patients, but they don’t cite their sources so it’s hard to verify.
Huffington post has an extensive article if you want to know more –

How is it used?

Nowadays, you can buy extracts from organically grown Turkey Tails. Traditionally, it was either boiled into a soothing tea, or chewed like gum! I may well give the tea a try, but I won’t be using it as gum! Boiling will kill any contaminants (including bugs), soften the flesh and extract the soluble polysaccharides (which are the medicinal compounds).


This site has some well structured information for identification etc. but basically, it has the multi-colour, fan shaped upper side that you can see in the pictures above. It has a white underside, with barely visible pores (up to 3 per mm), and white flesh. If it doesn’t have the white underside, it could be Velvet-Toothed polypore (Trichaptum biformis) with a violet, toothy underside, or the False Turkey Tail ((Stereum ostria) but that is more petal-shaped, hairy, and has a brown underside.

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