Nutty brittlegill

A firm white brittlegill of conifer woods

Russula integra has a cap 6 to 12 centimetres wide. It is nearly spherical when young, later flattened or depressed, shiny and usually brown, often tinged with violet, purple, yellow or green. The gills start white and turn bright yellow with age, and they are thick, widely spaced and crumble easily. The stalk is thick and white, 5 to 12 centimetres long, and it stains yellow or russet as it ages. The spore print is yellow-ochre.

The flesh is white, very firm and mild. The species grows scattered under conifers, especially spruce and fir in mountain forests, and is recorded across Europe and North America. It is rarer in some regions, such as New York, where it is found in August.

Taste, texture and use

Russula integra is popular in northern and central Europe. Its flesh tastes slightly of cashew and nut, with a crunchy texture, and it is called one of the choice edible Russulas. In Romanian it is called pâinişoară, which means little bread. David Arora, a North American mycologist, is quoted as saying it is good when young.

Its flavour is mild, so the species is generally cooked as an ingredient in its own right rather than as a seasoning. The sources consulted give no standard recipes or quantities, and none is given here.

Cooking and the 1878 toxicity study

The Wikipedia account of the species cites a study recorded in the Cyclopaedia of the Practice of Medicine, volume 17, published in 1878. That study concluded that long cooking removes the toxic properties, while rapid culinary processes such as roasting do not. Poisoning from the species was once frequent, and the account says it is now rare.

The practical consequence is that this brittlegill must be cooked for a long time, not briefly. Quick cooking alone is not a safe method according to this record, and a reader should not rely on roasting or brief frying to make the mushroom safe.

Lookalikes and identification

Russula mustelina is similar, with a brown cap, a white stalk, yellow spores and firm flesh. Other brittlegills that look alike have unknown edibility, and the genus is hard to separate by eye. Identification should be confirmed by someone experienced with Russula before the mushroom is eaten.

The sources give no safe quantity or storage time, and this page supplies none. Any wild mushroom should be treated with the same caution.

How to recognise a brittlegill

A mushroom is a brittlegill, a Russula, only when several features line up. The cap is usually brightly coloured. The gills are brittle: they snap when you try to bend them, and the flesh breaks cleanly like chalk instead of tearing into fibres. The stem carries no ring and no cup or sack at its base, and there are no veil remnants on the cap. The gills are attached to the stem, and a spore print is white, cream or dark yellow.

Two checks separate Russula from its look-alikes. Break a gill or cut the flesh: a brittlegill gives no milky juice, while a milkcap (Lactarius or Lactifluus) weeps latex. Then look at the stem. A ring on the stem, a cup or a sack or bulb with torn remnants at its base, or flesh that tears in fibres points away from Russula and towards Amanita, a genus that includes the deadly death cap and many other poisonous species. A mushroom with a ring or a cup at the base is not a Russula, whatever colour its cap is.

Recognising the genus is much easier than naming the species. Cap colour varies widely inside one species, so experts rely on the colour of the spore print, the taste, colour changes in the flesh, how far the cap skin peels, chemical tests and the microscope. A collector who is sure of the genus but not of the species should treat the species as unidentified.

The taste test, and what it cannot tell you

Foragers have long sorted brittlegills by taste. Break off a small piece of cap flesh or gill, chew it for several seconds and spit it out without swallowing; the burn of an acrid species can take half a minute to build. Brittlegills that taste mild are the traditional edibles. Those that taste hot, peppery or acrid, and many bitter ones, are left alone because they irritate the stomach and bowel and can cause vomiting and diarrhoea.

The method works only inside the genus. Use it once the mushroom is positively a Russula, never to decide whether an unknown mushroom is safe: the deadliest mushrooms do not taste unpleasant, and a mild taste says nothing about an Amanita, a Cortinarius or any other family. Within Russula it is a screen for rejecting species, not proof of safety. Some mild species are poor eating, rare species are poorly documented, and a few brittlegills have been linked with poisoning. Cook what you eat, start with a small portion, and identify to species where you can. This record is not a field guide.

Notes

The edibility statements in the sources are general and are not supported by a quantitative study of the species. Whether the old toxicity study applies to every population is not established. The catalogue records the species as a wild research item, and no cultivation or market data is given here.