Russula pseudocrustosa

Identity and name

Russula pseudocrustosa is the scientific name used in the catalogue, which treats it as a research name with no blanket current-name validation. The common name recorded is Asian green-cracking brittlegill.

Chinese green-cracking russulas have often been called R. virescens in local literature. A 2025 study places Asian collections of this morphotype in a related lineage and describes a new Southeast Asian species, R. orientalovirescens. The sources reviewed do not mention R. pseudocrustosa, so its relationship to these names is not established.

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.

Habitat and ecology

The catalogue describes the species as an ectomycorrhizal forest fungus, and it records the exact host association as needing verification. Supply is recorded as wild.

Food status

The 2026 Chinese species catalogue lists the species as edible or edible-and-medicinal. The catalogue marks it as a checklist lead: direct food-use evidence is needed, and no culinary tradition is recorded. Green-cracking russulas in general are sold at markets in China, but that general record is not evidence for this species.

Safety and limits

Identification and safety: a name, a photograph or one regional guide does not confirm that a wild specimen is this species. This page is not a collection key. Edibility statements refer to the named species as understood by each source, not any particular specimen. Russula is a large genus with many similar species. The catalogue states that the edible listing is a research lead, not an independent safety assessment, and that the species name needs checking before any record is relied on.