How to sort a mushroom basket after foraging: check every one

To sort your basket after the forest, tip the mushrooms out onto a table and lay them out one by one. Look at each mushroom from all sides: the cap, the underside of the cap, the stem right down to the base, and a cut. Set aside straight away any that are old, soft, slimy, mouldy or badly maggoty, and every one you are not 100% sure about. Clean the rest dry, don't wash them until you are about to cook, and cook them the same day. Below is all of this step by step, using our own basket as the example.

Our basket: what we brought home from the forest

We picked this basket on 29 September 2026 in a pine forest mixed with oak. It holds only boletes: porcini, birch boletes, aspen boletes and bay boletes. It seems that with mushrooms like these everything is simple, but even a familiar haul is worth sorting carefully. The danger usually hides not in the whole basket but in a single mushroom lost among the others.

From the side you can clearly see how the mushrooms lie in a heap: brown and chestnut caps, pale stems, a few with an already yellow pore layer. It's exactly in a pile like this that one stray mushroom is easy to miss, which is why at home a basket isn't sorted “wholesale”: you pick up every single mushroom.

Step 1. Tip everything out and lay them out one by one

Tip the basket out onto a table covered with newspaper or paper and spread the mushrooms in a single layer. That way you see each mushroom separately, not just the top layer. In the photo from above you can see how much variety there is: the orange caps of aspen boletes, pale stems with dark scales, the brown caps of bay boletes, and in a few mushrooms a yellow-greenish layer of tubes.

Why does this matter so much? A poisonous mushroom in the basket is not just a problem in itself. The science desk of Swiss broadcaster SRF reminds us: if a death cap ended up in the basket, the other mushrooms that lay next to it can no longer be eaten. So carry unfamiliar mushrooms, even ones you picked just “to show someone”, separately from the edible ones, in a different bag or box.

Step 2. What to throw out straight away

Fresh mushrooms are roughly nine-tenths water, and their dry matter contains a fair amount of protein. Because of the protein, German mycologists compare them to meat rather than vegetables, and even have a special term: “false mushroom poisoning”, meaning poisoning by spoiled edible mushrooms. The nausea, vomiting and diarrhoea in that case can be entirely real, even bad enough for hospital. So set aside without regret:

• old mushrooms: press a finger on the cap of a bolete, and if a dent remains, the mushroom is past its best;
• soft, slimy ones with a sourish or musty smell — this is already the start of spoilage;
• mouldy ones: a white or golden-yellow fluffy coating on boletes is a parasitic fungus, and the flesh beneath it decomposes; throw such a mushroom out even if the patch is small;
• badly maggoty ones: individual tunnels can be cut out, but a mushroom riddled right through goes in the bin;
• broken bits and pieces, from which you can no longer tell what the mushroom is;
• any mushroom you are not sure about. No exceptions here.

Slug marks on the cap are not a problem in themselves: the nibbled spot is simply cut away. More about overripe mushrooms in the article why you shouldn't pick old or wormy mushrooms.

Step 3. Check every bolete

Boletes are the most pleasant to sort: there are no amanitas among them. But a bitter or poisonous mushroom can end up in the same basket as porcini. Our full basket in the low autumn sun is exactly the case where everything looks fine at a glance, yet every mushroom still has to be checked.

For each bolete, ask yourself four questions:

1. What colour are the pores? Whitish, yellow or olive is normal. Pink pores are a typical sign of the bitter bolete, and red or orange-red ones are a reason to set the mushroom aside: such pores are found, for example, on the Devil's bolete, which can cause vomiting, stomach pain and diarrhoea.
2. What is the net on the stem like? On porcini it is fine and pale, especially at the top of the stem. On the bitter bolete the net is dark and brown, and the pores turn pink with age.
3. What's inside? Cut the mushroom lengthwise, from the cap to the bottom of the stem. That way you see both maggot tunnels and the colour of the flesh. Blueing on the cut does not by itself mean poison; we wrote about this in the article why Xerocomus boletes turn blue when cut.
4. Is it bitter? The bitter bolete is so bitter that one mushroom ruins the whole pot, and cooking, according to mycologists' observations, even intensifies the bitterness. So it's better to tell it apart by its pores and net before cooking. How exactly is explained in the article on the bitter bolete.

And one more small thing from our basket. When the pore layer of a porcini turns yellow-green, the mushroom, according to British mycologists' observations, is almost certainly already maggoty. Cut such mushrooms especially carefully; the soft pore layer can be removed.

Step 4. And if there are gilled mushrooms in the basket

There were no gilled mushrooms in our basket, but if you have some, the check is different. Three things matter most here:

• gill colour: white, pink, brown or chocolate, and whether it changes with age;
• a ring on the stem: whether there is one or not, membranous or in the form of bands;
• the base of the stem: whether there is a bulb, a sac-like volva or a rim.

A white ring, white gills and a sac or bulb at the base are the set of features of amanitas, among them the deadly death cap. So gilled mushrooms in the basket should be whole, with the base of the stem. If the base was cut off back in the forest, it can no longer be checked at home, and such a mushroom is better set aside. What each part is called is shown in the photos in the article mushroom anatomy.

On the same day we picked this basket, we left a white mushroom with a ring and a bulb in the forest: the gills aren't visible in our shots, and without them you can't say whether it's an amanita or an Agaricus. We gathered this story and other doubtful finds in the article mushrooms we left in the forest.

Step 5. Clean, but don't wash in advance

Mushrooms are cleaned dry: cut away soil and dark spots with a knife, and remove needles, sand and leaves with a brush or a napkin. Wash them only right before cooking, not before putting them in the fridge: Health Canada advises this too, because washing ahead of time spoils their quality. Cut out maggot tunnels, and if only half the mushroom is left afterwards, consider whether it's worth the effort.

How long mushrooms can wait

Not long. Stefan Fischer, a member of the board of the German Mycological Society, advises cooking raw mushrooms the same day or keeping them in the fridge for a day at most. Austria's public health portal explains why: mushrooms stored too long or incorrectly, especially without refrigeration, can themselves cause poisoning. That's why mushrooms are carried out of the forest in a basket, not in a plastic bag where they spoil faster, and at home they go into an open bowl or a paper bag on the bottom shelf of the fridge. Health Canada warns that in airtight containers without refrigeration dangerous bacteria can multiply in mushrooms, up to and including the one that causes botulism. Storage times for different mushrooms are covered in detail in the article how to store fresh mushrooms, and for how long.

This is what another of our hauls, from August 2025, looked like once home: porcini, most likely summer boletes, in a large glass dish. You can clearly see how different the mushrooms from a single walk can be: from tiny ones to big ones with a thick stem.

Our reward: fried potatoes with mushrooms

And that evening came the best end to the day: fried potatoes with wild boletes. Mushrooms must be cooked thoroughly: Germany's Federal Institute for Risk Assessment advises cooking every mushroom dish for at least 15 minutes, and the Swiss food safety authority advises not eating raw mushrooms at all. This applies especially to birch and aspen boletes: raw or undercooked, they quite often cause nausea and vomiting. Whether to boil mushrooms before frying, and for how long, we explained in the cheat sheet how long to boil mushrooms.

If some of the dish is left over, it is cooled quickly and put in the fridge, and after a short time in storage it is reheated thoroughly once: the German and Swiss state institutes allow this. And if anyone feels unwell after eating mushrooms, don't wait: call an ambulance (112 in the EU, 103 in Ukraine) and keep the leftovers of the dish and the peelings, they will help the doctors. What to do before the ambulance arrives is in the article mushroom poisoning: symptoms and first aid.

A quick checklist

• Tip out the basket and spread the mushrooms in a single layer.
• Pick up every mushroom: cap, underside of the cap, stem, base, cut.
• Old, soft, slimy, mouldy and maggoty right through: out at once.
• Boletes: pore colour, net, cut. Pink or red pores: set it aside.
• Gilled mushrooms: gills, ring, stem base. No base: we don't take it.
• Don't taste an unfamiliar mushroom: throw it out or show it to an expert.
• Clean dry, wash just before cooking, cook the same day and for at least 15 minutes.

More simple rules in the article seven rules for safe mushroom picking.